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。
Carbon molecules emitted by fossil fuels and deforestation linger for many centuries in the atmosphere before breaking apart.
化石燃料和毁林排放的碳分子滞留于大气中，经过许多世纪才能分解掉。
That is why they won't stall or linger, making the most out of their time with you so that they save as many hours for themselves as possible.
这就是为什么他们不会拖延或逗留，会充分利用他们与你在一起的时间，这样他们就可以尽可能地节省时间。
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