propitious vapours瑞气
flammable vapours易燃蒸气
Mists Vapours烟霭
overhead vapours塔顶蒸汽
poison vapours毒蒸气;毒云术
noncondensable vapours不凝性蒸汽
PETROL VAPOURS汽油气
nitrous vapours亚硝蒸气
Oil vapours油蒸气
N-VAR（有变体名词） Vapour consists of tiny drops of water or other liquids in the air, that appear as mist. 蒸汽
...water vapour.
…水蒸气。