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va.pour Br and AusAm and Aus va.por H5veI7pE5, $-pLngas which results from the heating of a liquid or solid蒸汽;汽;雾;烟雾The hollow glass tank contains hot mercury vapour. [U]那空心的玻璃槽里有热的水银蒸汽。Poisonous vapours burst out of the factory during the accident. [C]事故发生时有毒气体从那家工厂里迸溢而出。Warmer air is able to hold more water vapour than cold air and so has a higher humidity. [U]暖一些的空气比冷空气能容纳更多的水蒸气，因此湿度也就更高。The biggest greenhouse gas by far is water vapour. [U]最大的温室气体还是水蒸气。A vapour trail is water vapour seen as a line of white 'smoke'behind an aircraft as it flies.(飞机飞行时尾部留下的)雾化尾迹;拉烟High in the sky, we could see the vapour trails of the bombers moving northwards.在高高的天空，我们能够看到轰炸机向北飞去的一道道拉烟。
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