伊沃找来的是一座洗衣房后面的小桥。
Ivo found a little bridge behind the laundry.
桥只比一张桌子长，两块木板并排架在排水渠上，平时让人不用踩进泥里就能够到晾衣绳。自从渠边的地面开始错位，洗衣房便换了出口，桥留在那里，两端分别踩着不同高度的石头。
Only slightly longer than a table, it consisted of two planks laid side by side across a drainage channel. People had used it to reach the clothesline without stepping in mud. When the ground beside the channel began to shift, the laundry changed its exit. The bridge remained, its ends resting on stones of different heights.
“没有人用。”伊沃说，“桥下面最多淹死一只虫。”
“Nobody uses it,” Ivo said. “The most we could drown underneath is a bug.”
岚蹲下看，指了指渠里一条很小的鱼。
Lan crouched and pointed to a tiny fish in the channel.
“还有它。”
“And that.”
伊沃沉默片刻，找来桶，把鱼捞到旁边的池子里。岚看着他做，没有笑。Clay 在一旁把从旧校验箱里找出的铜灯放到木凳上。灯不是普通油灯，前端有两片很厚的镜，镜后留着能贴近眼睛的观察孔。
After a brief silence, Ivo found a bucket and moved the fish to a nearby pool. Lan watched without laughing. Beside them, Clay set a brass lamp from an old calibration case on a wooden stool. It was no ordinary oil lamp. Two thick lenses sat at the front, with an observation aperture behind them that could be held close to the eye.
箱子是伊沃保管的。里面有一张发黄的清单，写明这套东西用于校验分区灯的方向，不能独立供给街区。伊沃把清单夹在箱盖上，免得谁只记住灯还能亮。
Ivo had kept the case. Inside was a yellowed inventory stating that the equipment calibrated sector-light direction and could not power a district on its own. He clipped it inside the lid so nobody would remember only that the lamps still worked.
“和昨天手电不一样。”Clay 对岚说。
“Different from yesterday’s flashlight,” Clay told Lan.
“我知道。手电只让记录模型多看了一面。”她拿起其中一片灯镜，透过玻璃看桥，“这个能不能碰到真的东西，现在才知道。”
“I know. That only gave the recording model another view.” She lifted a lamp lens and looked through it at the bridge. “We’re about to find out whether these can reach the real thing.”
两盏校验灯接的是一只搬得动的旧电池。伊沃拆掉了原先连向主塔的接头，又将剪下来的短线摆在桌上，让另外两人看清楚。这里暂时不恢复任何完整灯区，也没有让不在场的人承担他们看不见的后果。
Both calibration lamps ran from an old portable battery. Ivo removed the connector that had once led to the main tower, then laid the clipped wire on the table for the others to inspect. They would not be restoring a full light sector here, or asking absent people to bear consequences they could not see.
Clay 检查了一遍，没再补充。
Clay checked it and had nothing to add.
岚拿出船长的图，画了一条线，标下当前的光向。随后她让 Clay 站在桥这头，自己站到对面，伊沃从旁边记时。他们像要给一张很难拍好的合照摆姿势，每个人都得稍微挪一点，却总挡住另一个人。
Lan took out the captain’s sketch, drew a line, and marked the current direction of the light. She placed Clay at one end of the bridge and herself at the other, with Ivo timing them from the side. It was like arranging a difficult group photograph: everyone needed to move a little, yet always blocked someone else.
“你往左。”岚说。
“Left,” Lan said.
Clay 挪过去。
Clay moved.
“我的左。”
“My left.”
他又挪回来。
He moved back.
伊沃低头写了一个字。
Ivo bent over his paper and wrote a word.
“这也要记？”Clay 问。
“You’re recording that too?” Clay asked.
“我写的是挡。”
“I wrote ‘blocked.’”
岚笑了一声，声音被铜镜后的小腔放大，听起来很奇怪。她自己也笑了，差点把眼睛从观察孔挪开。
Lan laughed. The small chamber behind the brass lens amplified it strangely. That made her laugh again, nearly lifting her eye from the aperture.
第一次什么都没发生。
Nothing happened on the first attempt.
两束光在桥中央碰到一起，木纹显得比原来清楚些，渠水照旧流。伊沃把一枚铜珠放到桥头，珠子顺着略斜的木板滚，滚到中央，向左偏了一下，掉进水里。
The beams met in the middle of the bridge. The wood grain looked a little clearer, but the channel flowed as before. Ivo placed a brass bead at the near end. It rolled down the slightly sloping plank, veered left at the center, and fell into the water.
他用网捞出来，又滚了一次。仍在同一处偏走。
He retrieved it with the net and rolled it again. It veered at the same point.
桥的两端看起来相连，中间却像错开了半寸。
The ends of the bridge appeared joined, but the middle seemed half an inch out of line.
Clay 调了灯镜的角度，想让两边映出来的木纹完全重叠。岚叫他停一下。
Clay adjusted the lamp lens, trying to overlap the wood grain from both sides exactly. Lan told him to stop.
“我这里的桥头变窄了。”
“My end’s getting narrower.”
“我这边正好。”
“It’s right on my side.”
“那还不是同一座。”
“Then it still isn’t the same bridge.”
这句话使 Clay 停住。他从孔后抬起头，直接看对岸的岚。隔着不到两步远的排水渠，她正用手比出她看到的边缘。
That stopped Clay. He lifted his head from the aperture and looked directly at Lan. Across a channel less than two paces wide, she outlined the edge she could see with her hands.
“你给我画出来。”他说。
“Draw it for me,” he said.
他们在纸上各画了一次。Clay 画出一块正面的木板，岚画的是有钉眼的斜面。两人都没有画错，只是校验灯把其中一面的判断强行套到了另一面上。
Each drew a view on paper. Clay drew the face of a plank; Lan drew an angled surface with nail holes. Neither was wrong. The calibration lamps were imposing one side’s judgment on the other.
伊沃翻出箱里的旧说明。最后一页有两个观察口的对照图，其中一条被墨划掉，旁边写着统一后再接入。
Ivo found the old instructions in the case. The last page compared two observation ports. One line had been crossed out in ink, with a note beside it: Align to a single view before connecting.
“统一成谁的？”他问。
“Whose view?” he asked.
纸上没有说。
The page did not say.
Clay 突然想起学校的两张地图。孩子指着昨天画在另一边的路，老师没有马上把它擦掉，而是让孩子把自己的纸拿到前面。
Clay suddenly remembered the school’s two maps. When the child pointed to a road drawn on the other side yesterday, the teacher had not erased it at once. She had asked him to bring his paper forward.
“不用把画重叠。”他说，“先找两张里面都有的东西。”
“Don’t overlap the drawings,” he said. “Find something that’s in both.”
他们选了桥边一颗外露的钉子。钉头方，锈迹从右下角拖出一条长尾。岚从自己的角度描述它，Clay 从这边找。他们调到能确认同一颗钉子的位置，保留两边不同的木纹方向。
They chose an exposed nail beside the bridge. Its head was square, with a long rust stain trailing from the lower right corner. Lan described it from her angle; Clay found it from his. They adjusted until they could identify the same nail while preserving the different directions of the wood grain.
伊沃再次放下铜珠。
Ivo released the bead again.
这一次，珠子滚过中央，撞在岚放在桥尾的木块上。
This time it crossed the middle and struck the wooden block Lan had placed at the far end.
三个人都没说话。
None of them spoke.
渠水咕噜噜地流，晾衣绳上的夹子在头顶碰着，隔壁有人将一桶水倒进排水口，泡沫一路漂来，从桥下穿过去。
Water gurgled in the channel. Clothes pegs knocked overhead. Next door, someone emptied a bucket into a drain; foam drifted toward them and passed beneath the bridge.
伊沃又放了一颗。
Ivo released another bead.
也过去了。
That crossed too.
“多久？”Clay 问。
“How long?” Clay asked.
“别问，先看着。”
“Don’t ask. Keep watching.”
岚的手指压在灯镜边缘。她看得很认真，嘴唇微张，似乎想说什么，又怕一说话就把眼前这点平稳惊走。
Lan’s fingers pressed against the edge of the lens. She watched intently, lips parted as though about to speak, yet afraid a word would frighten away this small steadiness.
第十七秒，镜片里出现一道细亮的岔影。
At seventeen seconds, a fine bright fork appeared in the lens.
桥尾的木块像有两个，一个仍在岚脚边，另一个偏到水面上。伊沃立即切断电池。灯光暗下，木块只剩一个，第三颗铜珠滚到桥中央，掉了下去。
There seemed to be two blocks at the far end, one still by Lan’s feet, the other shifted over the water. Ivo cut the battery at once. The light dimmed. Only one block remained. A third bead rolled to the center and fell.
Clay 眨了几次眼。阳光太亮，他一时觉得整块院子都在发白。
Clay blinked several times. The sunlight was so bright that for a moment the whole yard seemed to bleach white.
岚坐到渠边的石头上，握着自己的手腕。伊沃问她怎么样，她没有立即回答，先看了一眼头盔。
Lan sat on a stone beside the channel, holding her wrist. Ivo asked how she felt. Before answering, she looked at her helmet.
“刚才最后那颗珠子是谁放的？”她问。
“Who put down the last bead?” she asked.
“我。”伊沃说。
“I did,” Ivo said.
她点头。
She nodded.
Clay 也想不起自己为什么在第十七秒之前问了一次时间。他记得自己开过口，可那句话听起来像从旁边传来的。他看着记录表，没有急着填上一个解释。
Clay could not remember why he had asked the time before the seventeenth second either. He remembered speaking, but the sentence seemed to have come from beside him. He looked at the record sheet without rushing to supply an explanation.
他们把灯搬到阴处，等了很久才再试。
They moved the lamps into shade and waited a long time before trying again.
第二次，岚不用灯，换伊沃站在另一边，Clay 留在原处。桥维持了九秒，珠子过了，梁却在结束时发出一声干裂。第三次把两盏镜都交给 Clay，他来回看，两个孔里始终有一边歪着，珠子没有过去。
For the second attempt, Lan stood aside and Ivo took the other lamp, with Clay staying in place. The bridge held for nine seconds. The bead crossed, but the beam gave a dry crack at the end. On the third attempt, Clay took both lamps, looking back and forth. One aperture or the other always showed a skewed view. The bead did not cross.
“不是多摆一盏就够。”伊沃说。
“So it isn’t enough just to add a lamp,” Ivo said.
岚在旁边写下结果，另起一行记头晕和不确定的片刻。
Lan recorded the results, with a separate line for dizziness and the uncertain moments.
“也不能说已经知道代价。”她说，“十七秒里面看不出来的事，半小时后可能才会来。”
“We can’t say we understand the cost, either,” she said. “Something invisible in seventeen seconds might show up half an hour later.”
Clay 点头。直到那时，他才发现自己一直很想告诉另外两人，这条路有希望。他甚至已经想到把这些灯放到后街、市场和北堤，每个地方都有人站着，镇子重新连起来。
Clay nodded. Only then did he realize how badly he wanted to tell them this could work. He had already imagined lamps on the back street, at the market, on the north breakwater, people standing at each one, joining the town together again.
这个想法太快了，快得跳过了坐在石头上揉眼睛的岚。
The thought had raced ahead too quickly, skipping over Lan on the stone, rubbing her eyes.
他们只记录已经发生的事。
They recorded only what had happened.
中途诺拉来了，手里提着一篮刚洗好的桌布。她原是来找洗衣房的人，见他们蹲在排水渠旁，先看了一眼桥，再看铜珠。
Nora arrived partway through, carrying a basket of freshly washed tablecloths. She had come to find someone at the laundry. Seeing the three crouched beside the drain, she looked first at the bridge, then at the beads.
“你们三个忙了一早上，就为了不让球掉水里？”
“All three of you, all morning, just to keep a ball out of the water?”
“两颗过去了。”伊沃说。
“Two got across,” Ivo said.
“我昨天有三袋面粉过不来。”
“Yesterday I had three sacks of flour that couldn’t.”
伊沃把想解释的话咽回去。岚从石头上站起，告诉诺拉这是第一次短时试验，还不能用来过人或货。
Ivo swallowed his explanation. Lan rose from the stone and told Nora this was a first, brief trial. It could not carry people or goods yet.
诺拉把篮子放下，取出其中一块有洞的桌布，给受潮的电池垫在下面。
Nora put down her basket, took out a tablecloth with a hole, and spread it beneath the damp battery.
“那就先别让人听成能用了。”
“Then don’t let people hear that it can.”
她准备离开，目光落到 Clay 手上的新绷带，又转到他身后的椅子。
As she turned to leave, her eyes fell on Clay’s fresh bandage, then on the chair behind him.
“坐着做不行？”
“Can’t you sit down to do it?”
Clay 还没回答，伊沃已经把椅子拖到灯后，调了木凳的高度。Clay 坐下试了一遍，发现确实不需要一直半蹲。
Before Clay answered, Ivo had dragged the chair behind the lamp and adjusted the stool’s height. Clay tried sitting and discovered there was indeed no need to keep crouching.
他抬头想向诺拉道谢，她已经去隔壁晾桌布了。
He looked up to thank Nora, but she had already gone next door to hang the tablecloths.
院子里飘起肥皂味。白布从他们头顶经过，阳光被遮住，又缓缓透回来。岚盯着那些布，忽然说她好像记得一种比这个更刺鼻的清洗液。她能想起气味，想不起谁用它擦过什么。
Soap scented the yard. White cloth passed above their heads, screening the sun before slowly admitting it again. Lan watched it and suddenly said she thought she remembered a sharper-smelling cleaning fluid. She could recall the smell, but not who had used it to wipe what.
“先记下来？”伊沃问。
“Shall we write it down?” Ivo asked.
岚摇头。
Lan shook her head.
“这次我想先想一会儿。”
“This time I’d like to think about it first.”
两人没有催她。
Neither hurried her.
他们收拾试验台时，在桥下面发现一块旧铁牌，泥糊住了半边。伊沃用渠水洗净，露出曾经的编号和检验年份。那年份在七年前的事故之前。
While clearing their equipment, they found an old iron plate beneath the bridge, half covered in mud. Ivo washed it in the channel, exposing an old identification number and inspection year. The year preceded the accident seven years ago.
Clay 看着铁牌，认出上面的字迹是自己的。
Clay recognized his own handwriting.
“这桥我验过。”
“I inspected this bridge.”
“能用多少年？”伊沃问。
“How many years was it good for?” Ivo asked.
Clay 翻到背面。
Clay turned the plate over.
“当时只写下次雨季前再看。”
“All I wrote was to check again before the next rainy season.”
伊沃笑了一下，不是讥讽。
Ivo smiled, without mockery.
“看来它也被续期了。”
“Looks like it got renewed too.”
Clay 将牌子装回桥侧，没有把字重新描深。现在它的状况由眼前的人判断，不会因为旧签名还在，就自动变得可靠。
Clay reattached the plate without retracing the faded writing. The people here now would judge its condition. An old signature did not automatically make it sound.
午前，他们完成最后一次空载观察。两个人分别看见同一颗钉子，能让两端短暂对上；一旦其中一方把另一端当成与自己完全相同，镜里的岔影就会出现。至于为何人的观察能进入灯路、那段恍惚是否已经失去什么，他们仍没有答案。
Before noon, they completed one last unloaded observation. Two people identifying the same nail could briefly align both ends. Whenever one treated the far end as exactly identical to their own, the forked image appeared in the lens. Why human observation could enter the light circuit, and whether those moments of disorientation had already cost them something, remained unanswered.
岚把纸整理成三份。她不喜欢只有一个人拿着全部记录，因为如果那个人忽然不记得，别人就只能听他的说法。
Lan made three sets of records. She disliked one person holding everything. If that person suddenly forgot, the others would have only his account.
Clay 接过其中一份，又看了一眼那两颗越过小桥的铜珠。他把其中一颗放回伊沃的盒子，另一颗捏在指间。
Clay took a copy and looked again at the two beads that had crossed. He returned one to Ivo’s box and held the other between his fingers.
“借我带着。”他说。
“Let me borrow this.”
“别当成幸运东西。”伊沃说。
“Don’t make it a lucky charm,” Ivo said.
“它过桥的时候不是靠运气。”
“Luck didn’t carry it across.”
岚看向他。
Lan looked at him.
Clay 想了想，改口：“至少有两次，我们知道自己做了什么。”
Clay considered, then corrected himself. “At least twice, we knew what we’d done.”
她点头，将最后那句也写进记录旁边，特意保留了两次两个字。
She nodded and wrote that beside the results, taking care to keep the word twice.
主塔的钟声从远处传来。伊沃看一眼自己的表，说他们得走了。三个人锁好旧校验箱，给小桥重新挂上不能通行的牌子，把捞出的鱼送回流得平稳的那一段水里。
The main tower’s bell sounded in the distance. Ivo checked his watch and said they should leave. They locked the old calibration case, rehung the NO CROSSING sign, and returned the rescued fish to a stretch of steadily flowing water.
鱼立刻钻进阴影，没给他们任何感激的表示。
The fish darted into shadow without offering any gratitude.
去主塔的路上，Clay 用手指摸着口袋里的铜珠。它很小，形状也不完美，一面有浅坑。七年里，他第一次不是带着自己早就知道的答案走上那段台阶。
On the way to the main tower, Clay felt the bead in his pocket. It was small and imperfectly round, with a shallow pit on one side. For the first time in seven years, he climbed those steps without bringing an answer he already knew.
鸭嘴兽在塔门前等着，手里有一张目录，目录底部夹着一枚红色纸签。
The platypus waited at the door with a catalog, a red paper tab clipped to its bottom.
“原件取出来了。”他说。
“They’ve brought out the originals,” he said.
Clay 松开铜珠，手心留下一点圆形的凉意。
Clay released the bead. A small circle of coolness remained in his palm.