vapor 可数还是
vapor可数，复数形式是vapors vapor 美 /ˈveɪpər/ 英 /ˈveɪpə(r)/ n. 蒸气；水蒸气（等于 vapour） 双语例句： Water vapor is the gas form of water. 水蒸气是水的气体形式 "Efficient" irrigation is often used to describe systems that result in 85% of the water disappearing in vapor....