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【英语时差8,16】飞机凝结尾流（下）

时间：2016-02-19 08:08:28

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（单词翻译）

To make an airplane contrail, you need water and some kind of microscopic1 particle for the water to condense around. When jet fuel burns, it releases both water vapor2 and microscopic particles of exhaust. A contrail occurs when the jet’s water vapor condenses around its own exhaust particles. If you see a plane that’s leaving no contrail–or a very short one–this means the upper atmosphere is relatively3 dry. Dry air reabsorbs the water as invisible vapor almost as soon as it condenses. On the other hand, if you see a contrail that lasts a long time, this means the upper atmosphere is already saturated4 with as much water vapor as it can hold. Because of this, you sometimes can use contrails to predict the weather. Quickly fading ones suggest a dry upper atmosphere and fair weather. If you see a lot of long contrails in the sunset though, you might carry an umbrella the next day!
 

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1 microscopic nDrxq     
adj.微小的，细微的，极小的，显微的
参考例句：
  • It's impossible to read his microscopic handwriting.不可能看清他那极小的书写字迹。
  • A plant's lungs are the microscopic pores in its leaves.植物的肺就是其叶片上微细的气孔。
2 vapor DHJy2     
n.蒸汽，雾气
参考例句：
  • The cold wind condenses vapor into rain.冷风使水蒸气凝结成雨。
  • This new machine sometimes transpires a lot of hot vapor.这部机器有时排出大量的热气。
3 relatively bkqzS3     
adv.比较...地，相对地
参考例句：
  • The rabbit is a relatively recent introduction in Australia.兔子是相对较新引入澳大利亚的物种。
  • The operation was relatively painless.手术相对来说不痛。
4 saturated qjEzG3     
a.饱和的，充满的
参考例句：
  • The continuous rain had saturated the soil. 连绵不断的雨把土地淋了个透。
  • a saturated solution of sodium chloride 氯化钠饱和溶液

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