词典释义：
释义
n.
a substance diffused or suspended in the air, especially one normally liquid or solid
蒸汽；汽；雾
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dense clouds of smoke and toxic vapour 成团的浓厚烟尘与有毒汽雾
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[count noun]
petrol vapours 石油蒸气。
[count noun]
【物】 汽。比较<Bold>ＧＡＳ</Bold>.
(
〈旧〉 突然的昏厥感；突然的紧张感；癔病性忧郁。
v.
talk in a vacuous, boasting, or pompous way
吹牛； 吹嘘；自夸
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he was vapouring on about the days of his youth. 他不停吹嘘自己年青岁月。
词源
"late Middle English： from Old French, or from Latin