第三天的试验没有安排过桥。
The third day’s trial did not include crossing the bridge.
伊沃在纸的最上面写了这句话，又把纸贴到洗衣房的门上。今天洗衣房停用半个上午，里面的衣物已经搬到隔壁。排水渠两侧都拉了绳，旁边没有看热闹的人，连搬煤的也被请去另一条路。
Ivo wrote that at the top of the sheet and posted it on the laundry door. The laundry would close for half the morning; the clothes had been moved next door. Ropes cordoned off both sides of the channel. There were no spectators. Even the coal carriers had been asked to take another route.
诺拉把最后一篮桌布抱走时，问他要多久。
As Nora carried away the last basket of tablecloths, she asked how long they needed.
“午饭前收。”
“Packed up before lunch.”
“别只记在你们的表上。”她说。
“Don’t put it only on your clocks,” she said.
伊沃点头，写下镇表的结束时刻。
Ivo nodded and added the finishing time by the town clock.
Clay 到得早，带来两只更稳的支架。掌心开始结痂，握东西仍得小心。他没有带 Miso，狗前一晚吃得太多，早上只肯在暖处翻个身。诺拉嫌它挡路，最后还是绕着它走。
Clay arrived early with two steadier stands. His palm was scabbing, though he still had to grip things carefully. He had left Miso behind. The dog had eaten too much the night before and would only roll over in a warm spot that morning. Nora complained that he blocked the way, then walked around him.
岚带着两份新的天气记录，头盔留在观测站，穿借来的厚外套。宇航服里面的衣服是深蓝色，袖口有银色的细线。她走路轻便了很多，手却总去摸领口，像少了一件习惯护着脖子的东西。
Lan brought two fresh weather records. Her helmet stayed at the observatory; she wore a borrowed heavy coat. Beneath the spacesuit, her clothes were dark blue with fine silver lines at the cuffs. She walked far more easily now, though her hand kept going to her collar, as if something accustomed to protecting her neck were missing.
他们没有把两盏灯接回旧电网，也没动完整分区。要试的只是让小桥稳定稍久一点，确认昨天并非角度巧合。伊沃在两侧各放一块画有格子的白板，使站着的人不必不停向前探。切断电池的拉柄就在他手边，灯罩上还加了遮片。
They did not reconnect the lamps to the old grid or touch a complete sector. They meant only to hold the little bridge steady a little longer and confirm that yesterday had not been an accident of angle. Ivo set a gridded white board on each side so nobody needed to keep leaning forward. The battery disconnect was beside his hand, and shutters had been added to the lamps.
“谁说停，就停。”岚说。
“If anyone says stop, we stop,” Lan said.
“停。”伊沃重复一遍，拉下开关。两盏灯同时暗了。
“Stop,” Ivo repeated, pulling the switch. Both lamps went dark.
他们先这样试了一次，没有人笑。
They practiced that first. Nobody laughed.
第一次正式接通时，铜珠过了桥，镜内白板没有分叉。岚在另一侧描述自己看见的刻线，Clay 根据钉子的位置调整左镜。他没有再要求两人的图一模一样，而是等她把不同的部分说完。
On the first powered attempt, the bead crossed and the boards did not split in the lenses. Lan described the lines she saw from the far side; Clay adjusted the left lens against the nail’s position. He no longer demanded identical views. He waited for her to finish describing the differences.
第十二秒，伊沃切断电池。桥面轻轻错开，铜珠已经停在另一端的木槽里，没有落水。三个人互相看了一眼，各自在纸上记下。
At twelve seconds, Ivo cut the battery. The bridge shifted slightly out of alignment, but the bead was already in the wooden trough at the far end and did not fall. They looked at one another and each recorded it.
“头晕吗？”伊沃问。
“Dizzy?” Ivo asked.
岚摇头。Clay 也没有。
Lan shook her head. Clay was not either.
他们休息了一刻钟。隔壁传来晾衣架倒下的声音，有人骂了一句，又有人笑。伊沃拿起剩下半块面包，边吃边检查灯座，Clay 则看着镜片里那条很细的分界。
They rested for fifteen minutes. Next door a drying rack fell; someone swore and someone laughed. Ivo picked up his remaining half-slice of bread and inspected the lamp base while eating. Clay watched the thin dividing line in the lens.
他开始想象，如果把这条线移到真正的路上，会有多少原本困住的东西可以回来。面粉、药、学校放学的孩子。不需要一下救下全镇，哪怕先让一条街不再忽然从中间断开。
He began imagining how much could return if they moved that line onto a real road: flour, medicine, children leaving school. They need not save the entire town at once. Even one street that no longer broke suddenly down the middle would do.
岚看见他的目光，问他在想什么。
Lan caught his look and asked what he was thinking about.
“一辆手推车。”
“A handcart.”
“先让球多过几次。”
“Let the ball cross a few more times first.”
“我知道。”
“I know.”
他说得很快。岚没有接着提醒，把水杯递给他。
He answered quickly. Lan did not repeat the warning, but handed him a cup of water.
第二次接通前，主塔的光从院墙上扫过。
Before the second attempt, the main tower’s beam swept across the yard wall.
太阳已经升高，白天看见那束光原本很不明显。只有镜边露出一点冷色，使铜灯上的锈斑显得像一滴水。伊沃抬头看了眼，把主塔经过的时刻也记在纸上。
The sun was high, and the beam was normally hard to see by day. Only a cool glint at the edge of the lens made a rust spot on the brass look like a drop of water. Ivo glanced up and recorded the time of the tower’s pass too.
桥面起初很稳。
At first the bridge was steady.
第六秒，岚说左边多了一颗钉子。
At six seconds, Lan reported another nail on the left.
Clay 从孔后看过去。桥头只有他们一直对照的那颗方钉，右下角有锈尾。他把自己看到的位置说出来，岚却说另一个钉头在更靠里，已经占住了原先的刻线。
Clay looked through the aperture. There was only the square nail they had been using, with its rust tail at the lower right. He described its position, but Lan said the other nail head was farther in and had already taken the place of the original line.
“别跟着它调。”伊沃说。
“Don’t adjust to follow it,” Ivo said.
Clay 没动灯座。他只是换了下视角，想确认那是反光还是桥上真的多出一个位置。
Clay did not move the base. He merely changed his viewing angle, trying to determine whether it was a reflection or a real new position on the bridge.
镜里的白板忽然变成了旧木栏。
The white board in the lens suddenly became an old wooden railing.
他看见一个很年轻的伊沃站在栏后，肩上扛着线，正等他发话。那画面只闪了一瞬，但足够让他的手僵住。
A very young Ivo stood behind it, cable over his shoulder, waiting for Clay to speak. The image lasted only an instant, but long enough to freeze his hand.
“停。”岚说。
“Stop,” Lan said.
Clay 听见了。
Clay heard her.
“有另一——”
“There’s another—”
他还没说完，伊沃已经拉下开关。
Before he finished, Ivo had pulled the switch.
灯没有立即灭。
The lamps did not immediately go out.
铜灯内的光像被夹在两层玻璃之间，一层熄了，另一层仍亮。桥在那层光里猛地向右移，连着灯座的木凳脚滑出原位，伊沃为了不让支架倒向岚，伸手扶了一下。
Their light seemed trapped between two panes of glass. One layer died; the other shone on. Within that layer the bridge lurched right. The stool leg supporting a lamp slid out of place. Ivo reached to steady the stand before it fell toward Lan.
白板从中间折了。
The white board folded in the middle.
不是木头折断。格子向两个方向错开，左边还立着，右边却与地面重合。伊沃的脚踝夹在凳脚与渠沿之间，他往后挣，灯镜突然喷出一片灼亮的光。
The wood had not snapped. Its grid shifted in two directions: the left remained upright, while the right overlapped the ground. Ivo’s ankle caught between a stool leg and the channel edge. As he struggled backward, the lens erupted in a sheet of scorching light.
他叫了一声。
He cried out.
Clay 推开镜片前的遮板，想把最后那层光挡住。遮片被夹住，不能完全合拢。他看见岚抬起木槽，直接翻过来扣住另一侧观察孔。两边的白光终于断开，院子重新落回普通日光里。
Clay pushed at the shutter in front of the lens, trying to block the final layer. It was jammed and would not close fully. He saw Lan lift the wooden trough and turn it over the other observation aperture. At last the white light broke on both sides, and ordinary daylight returned to the yard.
伊沃躺在渠边，左脚还卡着，前臂的袖子烧出一块深色。
Ivo lay beside the channel, his left foot still trapped, a dark patch burned through his forearm sleeve.
Clay 跪下去扶灯架，手掌伤口立刻裂开。他没有感觉到疼，只看见伊沃脸上失去了血色，牙关咬得很紧。
Clay knelt to lift the lamp stand. His palm split open at once. He felt no pain; he saw only the color gone from Ivo’s face and his tightly clenched jaw.
“别拉腿。”岚说。
“Don’t pull his leg,” Lan said.
她绕到木凳另一侧，把凳脚往外推。Clay 抬起支架，直到伊沃的脚能从空隙里出来。他们没让他马上站起，把人移到干处，垫高受伤的腿，叫隔壁的人去主塔找照护员。
She went around the stool and pushed its leg outward. Clay lifted the stand until Ivo’s foot could clear the gap. They did not let him stand immediately. They moved him to dry ground, raised the injured leg, and sent someone next door to fetch a caregiver from the tower.
诺拉第一个赶到。
Nora arrived first.
她看到地上的黑布和伊沃的脸，没有问谁搞的，先将路上的椅子全部搬开，让后面的人能进来。岚把试验电池提到远处，合上箱盖，在箱上写不要使用。
Seeing the burned cloth and Ivo’s face, she did not ask who had caused it. She moved every chair out of the way so others could reach him. Lan carried the battery away, shut its case, and wrote DO NOT USE on top.
Clay 还跪着，盯着那层已经不亮的镜。
Clay was still kneeling, staring at the lens that no longer shone.
伊沃抓了抓他的袖子。
Ivo tugged his sleeve.
“别看灯。看我。”
“Don’t look at the lamp. Look at me.”
Clay 立刻转头。
Clay turned at once.
“我听得见。”伊沃说，“这次我听得见。”
“I can hear,” Ivo said. “This time I can hear.”
他在确认自己没有像北侧那样被隔到另一边。Clay 点头，告诉他人都在，没再说一定没事。
He was checking that he had not been cut off on the other side, as at the north shore. Clay nodded and told him everyone was here. He did not say everything would certainly be fine.
照护员到了以后，替伊沃处理了前臂和脚踝，带他去主塔休息。岚和诺拉跟着，Clay 留下来收拾。他把每一件东西放回原处以前先记下位置，却几次把同一段记录写错，笔尖在纸上戳出小洞。
The caregiver treated Ivo’s forearm and ankle and took him to the main tower to rest. Lan and Nora went with him. Clay stayed to clear up. Before replacing each object, he recorded its position, but several times he wrote the same passage incorrectly, his pen piercing tiny holes in the paper.
第六秒发现第二钉。
Second nail observed at six seconds.
第八秒说停。
Stop called at eight seconds.
开关已断，镜内余光未断。
Switch disconnected; residual light in lens continued.
他写到这里，停下来，在旁边另加一句：我想继续看清，没有立即移开。
He paused there and added a sentence beside it: I wanted to see clearly and did not immediately move away.
纸上这句话很短，短到不能容下伊沃刚才叫的那一声。
It was a short sentence, too short to contain Ivo’s cry.
Dr. T 是从主塔直接过来的。看见小桥和两盏灯，他脸色变了，走过去检查旧镜背面的编号。
Dr. T came directly from the main tower. His expression changed at the sight of the bridge and two lamps. He went to examine the numbers on the backs of the old lenses.
“你们断了供电线。”他说。
“You disconnected the power leads,” he said.
“都断了。”Clay 指给他看。
“All of them.” Clay showed him.
“但镜里的参照还在。”
“But the reference remains in the lenses.”
Dr. T 将灯镜侧面一条几乎看不见的缝照出来。缝中夹着一片旧校准片，边缘已经发黑。那片东西不随电池断开而清空，它仍保留着主塔过去给过的方向。
Dr. T shone a light along a nearly invisible slit in the lens housing. An old calibration insert sat inside, its edge blackened. Disconnecting the battery did not clear it. It still retained the direction previously supplied by the tower.
“我们以为它只是记录位置。”Clay 说。
“We thought it only recorded position,” Clay said.
“它是用来把本地位置接回旧参照的。没有主塔的线，也可能沿着先前的关系回去。”
“It reconnects local position to the old reference. Even without a tower cable, it can follow the prior relationship back.”
Clay 盯着那一小片黑边。
Clay stared at the tiny blackened edge.
“说明书里没有。”
“That isn’t in the instructions.”
“因为这套校验箱做出来的时候，我们也不知道它会这样。”
“When this calibration case was made, we didn’t know it could happen.”
“后来知道了，为什么没写？”
“Why didn’t you write it down when you found out?”
Dr. T 没立即回答。他把校准片重新放回，盖上护板。
Dr. T did not answer immediately. He replaced the insert and closed its guard.
“我封存过。”
“I put it out of service.”
“你封存了盒子，留下伊沃每天修的街。”
“You put the case away and left Ivo with streets to repair every day.”
Dr. T 看向他。Clay 也知道这句话只能算一半。盒子里确实写着不能独立供给街区，他们没有这样做，却把有限的说明当成了足够的理解。后街黑槽不能接，谁也没有告诉他们为何不能接；他们也没有等到弄清，就开始尝试。
Dr. T looked at him. Clay knew it was only half the truth. The case plainly said it could not supply a district independently. They had not done that, but they had mistaken limited instructions for sufficient understanding. They had been forbidden to connect the black slot on the back street without being told why. They had also begun trying things before they understood.
院子里的洗衣夹还在碰。前一天他们在这里笑过，搬鱼、递水、看两颗小球滚过木板，那种轻快现在留在同一片日光里，显得离人很远。
Clothes pegs still knocked in the yard. The previous day they had laughed here, moved a fish, passed water, watched two little balls roll across planks. That lightness remained in the same sunlight, now very far away.
“伊沃怎么样？”Clay 问。
“How is Ivo?” Clay asked.
“前臂烧伤，脚踝扭了。照护员说要休息，暂时不能负重干活。伤口得再看。”
“Burned forearm, sprained ankle. The caregiver says rest, no work bearing weight for now. The wound needs checking again.”
Clay 把纸折起来，又展开。
Clay folded the paper, then unfolded it.
“现在把结算册给我。”
“Give me the settlement ledger now.”
Dr. T 看向他手里沾了血的记录。
Dr. T looked at the bloodstained notes in his hands.
“今天本来就约了。”
“We were already due to meet today.”
“那就现在。还有这种镜为什么会回到旧参照。别再只给能让我继续修东西的那一部分。”
“Then now. And why these lenses return to the old reference. Don’t give me only the part that lets me keep repairing things.”
Dr. T 点了一下头。
Dr. T nodded once.
到了主塔，Clay 先去看伊沃。诺拉坐在旁边，把他工具袋里最重的几样东西取出来，另放一处。伊沃不高兴，说自己只是伤了腿，她说那就等腿好后自己搬回去。
At the tower, Clay first visited Ivo. Nora sat beside him, removing the heaviest items from his tool bag and setting them apart. Ivo complained that it was only his leg. She told him he could carry them back himself once it healed.
岚站在窗边，手里握着那块被她扣在镜孔上的木槽。木槽的一角焦了，她一直没丢。
Lan stood by the window holding the trough she had used to cover the aperture. One corner was charred. She had not discarded it.
“我说停了。”她对 Clay 说。
“I said stop,” she told Clay.
“我听见了。”
“I heard.”
“你那时还想看什么？”
“What were you still trying to see?”
Clay 说出年轻伊沃的影像。
Clay described the image of young Ivo.
岚低头看了看焦黑的木头。
Lan looked down at the burned wood.
“我那里不是他。我看见一截走廊，我觉得自己应该认识。所以我说停。”
“It wasn’t him on my side. I saw part of a corridor. I felt I ought to know it. That’s why I said stop.”
她没有责怪他为什么还想看，也没有替他说两人都有好奇。她只把两个选择放到他面前：同样遇到一段渴望理解的过去，她说停，他想把它看清。
She did not accuse him of wanting to keep looking, or excuse him by saying both were curious. She only placed two choices before him: faced with a past they longed to understand, she had said stop, and he had tried to see more clearly.
Clay 向她道歉，随后走到伊沃床边。
Clay apologized, then went to Ivo’s bed.
“灯断了还会保持旧参照，我们不知道。”他说，“可你说停时，我应该先停自己的动作。”
“We didn’t know the old reference would remain after the lamp lost power,” he said. “But when you called stop, I should have stopped what I was doing first.”
伊沃没看他，手指在被子上敲着。
Ivo did not look at him. His fingers tapped the blanket.
“等以后修的时候，开关不要只在我这边。”
“Next time we repair anything, don’t put the only switch on my side.”
“好。”
“All right.”
“也不能只切电。把那层还在亮的东西隔开。”
“And don’t just cut the power. Isolate the layer that keeps shining.”
Clay 点头。
Clay nodded.
“还有，”伊沃终于抬起脸，“别把这次写成因为我手伸快了。我知道自己伸了。但架子为什么会倒，不是我的手造成的。”
“And,” Ivo finally looked up, “don’t write this as happening because I reached too fast. I know I reached. But my hand wasn’t why the stand fell.”
“不会。”
“I won’t.”
Clay 当着他的面，把记录展开，让他看见那句“我想继续看清”。伊沃读完，移开目光，没有说原谅他。
Clay unfolded the record in front of him, showing the sentence about wanting to see clearly. Ivo read it and looked away. He did not say he forgave him.
门外，鸭嘴兽抱着蓝棺里取出的旧工作服，正和 Dr. T 一起走来。棺材昨天已经还了，衣服叠在档案屋里，直到 Clay 让人取过来。
Outside, the platypus approached with Dr. T, carrying the old work clothes from the blue coffin. The coffin had been returned yesterday. The clothes had stayed folded at the archive until Clay sent for them.
他记起当年试灯时，自己总把最重要的读数写在纸片上，塞进衣服内侧的暗袋，免得湿透。
He remembered how, during the old lamp trial, he always wrote the most important readings on scraps and tucked them into a hidden inner pocket to keep them dry.
现在，他需要知道那一天自己到底把什么留在了里面。
Now he needed to know exactly what he had left in there that day.