Space walkers see whole continents, mountain ranges, cities, aircraft contrails and the wakes of ships crossing the oceans.
这位宇宙漫步者看到了整片大陆、山脉、城市、飞机轨迹以及越洋轮船的波浪。
Contrails appear most vivid around sunrise or sunset, and it's not uncommon that one showing up in an unexpected location will generate whispers of a UFO or experimental military aircraft.
凝结尾在日落和日出时，会显露得非常生动，这种情况并不少见，一个意外的位置上所显露出来的现象将产生与ufo或实验用军事飞机相类似的低低声音。
Contrails are clouds of ice particles formed around the small particles released from aircraft exhaust.
飞机划过天空时排出的尾气凝成小冰粒，它们周围逐渐聚集了更多冰粒，形成了凝结尾迹。
Although some so-called contrails, which are simply clouds of tiny ice crystals condensed from the moisture in aircraft exhaust, evaporate quickly, many linger for hours and spread across the sky.
这些所谓的“飞行云”不过是飞机尾气中的湿气冷凝而成的云状微型冰晶颗粒，尽管其中有些会很快蒸发，但是很多会逗留数小时，并弥漫天空。
Although some so-called contrails, which are simply clouds of tiny ice crystals condensed from the moisture in aircraft exhaust, evaporate quickly, many linger for hours and spread across the sky.
这些所谓的“飞行云”不过是飞机尾气中的湿气冷凝而成的云状微型冰晶颗粒，尽管其中有些会很快蒸发，但是很多会逗留数小时，并弥漫天空。
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