a mass of very small drops of liquid in the air, for example steam 蒸气;潮气;雾气 water vapor 水汽 The particles then form a vapor. 这些粒子然后形成蒸汽。 There was a hissing sound, and clouds of vapor were emitted. 有嘶嘶的声音,和蒸汽云发射。
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