The Echo over Calder Field

At five in the morning, Calder Field smelled of cut grass and cold metal. Fourteen balloons lay stretched across the meadow like sleeping animals, and the only light came from the gas burners of the crew testing their flames.

凌晨五点，考尔德场地弥漫着刚割过的青草和冰冷金属的气味。十四个热气球横躺在草地上，像一群沉睡的动物，唯一的光亮来自地勤人员试火的燃烧器。

Nami stood on the announcer's platform with the microphone in both hands. It was not a normal microphone. The university had lent it to the field two months earlier, with a warning on a sticky label: PROTOTYPE. DO NOT DROP. DO NOT EXPLAIN TO VISITORS.

娜米站在播音台上，双手握着麦克风。这不是一支普通的麦克风。两个月前，大学把它借给了这片场地，上面贴着一张便利贴，写着警告：原型机。请勿摔落。请勿向游客解释。

Every sound she made into it came back a few seconds later, thin and slightly bent, like a voice from the bottom of a well. The students called it the echo microphone. It was supposed to measure the layers of air above the field, and in the first week she had hated it.

她对着它发出的每一个声音，都会在几秒钟后传回来，又薄又有点走样，像从井底传上来的声音。学生们管它叫回声麦克风。它本该用来测量场地上空的各层空气，而第一周里，她恨透了它。

"Good morning, pilots," she said now.

“早上好，飞行员们，”她现在说道。

Good morning, pilots, said the sky, very faintly, six seconds later.

早上好，飞行员们，天空说，声音非常微弱，六秒钟之后。

"That's a long one," said Verena, climbing the steps with a mug of coffee and a clipboard. She was the lead pilot of the field, a tall woman in a flight jacket. It had been repaired so often that it was mostly patches. "Yesterday it came back in four."

“这回可真长，”维蕾娜说着，端着一杯咖啡、拿着一块记事板走上台阶。她是这片场地的首席飞行员，一个穿着飞行夹克的高个子女人。那件夹克修补过太多次，上面几乎全是补丁。“昨天只要四秒就传回来了。”

"It keeps rising," said Nami. "Six seconds up and down means something solid, about a kilometre over our heads. A sheet of warm air, sitting there like a lid. The students say it will vanish once the sun gets strong."

“它一直在升高，”娜米说，“一来一回六秒，说明头顶大约一公里处有什么实实在在的东西。一层暖空气，像盖子一样扣在那里。学生们说，太阳一变强，它就会消失。”

"Which is exactly my problem," said Verena.

“这正是我的难题所在，”维蕾娜说。

She held out the clipboard. On it were two flight plans, and she had been carrying them around since midnight.

她递出记事板。上面有两份飞行计划，她从午夜起就一直带着它们到处转。

The first was the school flight. A class of fifteen-year-olds from the valley had spent a whole term building twelve tiny sensors, each the size of a matchbox. They wanted them lifted to the warm layer and dropped through it on small parachutes. It was the first real science many of them had ever done.

第一份是学校飞行。山谷里一个班的十五岁学生，花了整整一个学期做了十二个小传感器，每个只有火柴盒那么大。他们想把传感器带到暖空气层，再让它们挂着小降落伞穿过那一层落下来。对许多孩子来说，这是他们第一次做真正的科学研究。

The second was the film flight. A small crew wanted to shoot the sunrise from a balloon basket for a documentary about the valley. Their payment would cover the field's insurance for half a year, and the producer had said, politely but firmly, that she could only come today.

第二份是拍摄飞行。一个小剧组想在气球吊篮里拍日出，用于一部关于山谷的纪录片。他们付的钱够场地的保险费用支撑半年，而制片人也客气但坚决地说过，她只有今天能来。

"I have one balloon with enough lift for either," said Verena. "Both are good flights. Both people trusted me. I keep adding up the reasons, and the numbers never come out different."

“我只有一个气球，升力够做其中任何一件事，”维蕾娜说，“两次飞行都很好。两边的人都信任我。我把理由一遍遍加起来，数字就是算不出不同的结果。”

"Then flip a coin," said Nami.

“那就抛硬币吧，”娜米说。

"I tried. I didn't like the result, so I flipped it again."

“试过了。我不喜欢那个结果，就又抛了一次。”

Nami laughed, and the laugh came back to them from the sky a moment later, small and strange. She looked at the clipboard, then at the microphone. A thought was forming, but she did not trust it yet.

娜米笑了，笑声片刻之后从天上传了回来，小小的，怪怪的。她看看记事板，又看看麦克风。一个念头正在成形，可她还不敢相信它。

"Give me ten minutes," she said. "I want to listen to something."

“给我十分钟，”她说，“我想听点东西。”

She turned the microphone toward the east, where the first pale line was opening over the hills, and spoke slowly into it. "Counting. One. Two. Three."

她把麦克风转向东方，那里第一道淡淡的光线正在山丘上方裂开，然后对着它慢慢地说：“数数。一。二。三。”

The echo returned. Counting, it said. One. Two. Three. Nami checked her watch and counted under her breath. Six seconds, then a little less. She waited a minute and repeated the test.

回声回来了。数数，它说。一。二。三。娜米看看手表，在心里默数。六秒，然后少了一点。她等了一分钟，又试了一次。

Five and a half.

五秒半。

She waited again, and the next echo returned in a little over five.

她再等了一会儿，下一次回声在五秒多一点的时候回来了。

"Verena," she said quietly. "Come here and listen."

“维蕾娜，”她轻声说，“过来听听。”

They stood together while she spoke into the microphone three times, each a few minutes apart. The delay was shortening every time. The layer was not simply sitting over the field. It was sinking toward the ground as the sun climbed and the lower air began to warm.

她们并肩站着，娜米对着麦克风说了三次，每次间隔几分钟。延迟一次比一次短。那层空气并不是简单地停在场地上空。随着太阳升高、低处的空气开始变暖，它正朝地面沉下来。

"How long?" said Verena.

“还有多久？”维蕾娜问。

"The students told me it would flatten out in about an hour. At this speed, I think it is less. Forty minutes, perhaps." Nami swallowed. "After that, there will be nothing to measure. And the film crew can fly again tomorrow. Can the students?"

“学生们告诉我，大约一小时后它就会变平。按这个速度，我想用不了那么久，也许四十分钟。”娜米咽了口唾沫，“那之后就没有什么可测的了。而剧组明天还可以飞。学生们呢？”

Verena did not answer straight away. She looked at the clipboard and then at the hills, where the line of light had turned from grey to the colour of pale honey.

维蕾娜没有马上回答。她看看记事板，又看看山丘，那里的光线已经从灰色变成了淡蜂蜜的颜色。

"No," she said. "Their sensors are built for one thing. A layer like this might not come again for weeks, and the class goes on holiday on Friday." She breathed out. "The film is good work. But a sunrise comes back every day, and this does not."

“不行，”她说，“他们的传感器只为一件事而造。这样的空气层也许几个星期都不会再来，而且这个班周五就放假了。”她呼出一口气，“拍摄是好作品。可日出每天都会回来，这个却不会。”

"So you have your answer."

“这么说你有答案了。”

"I have my answer," said Verena, and her whole body seemed to loosen. "I just needed somebody to hand me a reason I could not argue with."

“我有答案了，”维蕾娜说，整个人仿佛都放松了下来，“我只是需要有人递给我一个我无法反驳的理由。”

She went down the steps two at a time and began shouting for the ground crew. Somebody ran to the van for the harness. Somebody else ran to find the school team, and for a while the whole field was moving in a hurry. Soon the school team arrived, still half asleep in their jackets, carrying the twelve sensors in a padded box. They had been so sure they would be refused that nobody had brought a camera.

她两级并作一级地跑下台阶，开始大声叫地勤人员。有人跑去面包车上取吊带，有人跑去找学校的小组，一时间整片场地都匆匆忙忙地动了起来。不久，学校小组到了，穿着夹克还睡眼惺忪，抱着装有十二个传感器的软垫盒子。他们原以为一定会被拒绝，所以谁都没带相机。

Verena checked every sensor herself, one at a time, reading the small green numbers on each screen aloud. The students stood around her in a nervous half circle, and nobody dared to ask a single question until she finished. The producer was not happy when she was told. She nodded, however, when Verena offered her the first seat on tomorrow's flight, and she stayed to watch.

维蕾娜亲自逐个检查每个传感器，把每块屏幕上的绿色小数字大声念出来。学生们围成紧张的半圆站在她身边，直到她检查完，没有人敢问一个问题。制片人得知消息时很不高兴。不过，当维蕾娜提出明天的飞行让她坐第一个位子时，她点了点头，并留下来观看。

At twenty to six the burners roared. The envelope filled, trembled, and slowly stood upright against the pale sky. Two of the students climbed into the basket with their padded box, laughing nervously, and Verena took the controls with one hand on the cord. She lifted her other hand to Nami in a short wave.

五点四十分，燃烧器轰然作响。气球的球囊鼓起来，颤动着，慢慢在淡色的天空下竖直站立。两名学生抱着软垫盒子爬进吊篮，紧张地笑着，维蕾娜一手握着拉绳，掌控了操作。她另一只手抬起来，向娜米短短地挥了一下。

Nami raised the microphone one last time. She did not make an announcement. She simply said, "Good luck," and listened.

娜米最后一次举起麦克风。她没有做任何广播。她只是说了一声：“祝你们好运”，然后倾听。

The balloon rose, slowly at first and then with a steady, easy climb. It drifted over the fence, over the long line of poplars, and into the thin gold light. Its shadow slid across the meadow and disappeared. Soon it was only a small orange coin above the hills, getting smaller.

气球升起来，起初很慢，随后是平稳轻松的攀升。它飘过围栏，飘过那一长排白杨，进入稀薄的金色光线中。它的影子滑过草地，消失了。不久，它只是山丘上方一枚小小的橙色硬币，越来越小。

Nami held the microphone against her chest and waited. A few seconds later, from somewhere very high above the field, the sky said it back to her, as softly as a breath.

娜米把麦克风抱在胸前等待。几秒钟后，从场地上空某个非常高的地方，天空把那句话说回给她，轻得像一声呼吸。

Good luck.

祝你们好运。