a visible suspension in the air of particles of some substance
the process of becoming a vapor
例句
用作名词 (n.)
The locomotive vomits out vapor when getting started. 火车头启动时喷出大量蒸汽。
A cloud is a mass of vapor in the sky. 云是天空中的水汽团。
Warm air can contain more water vapor than cold air. 热空气要较冷空气容纳更多的水蒸汽。
用作动词 (v.)
Topically, 1 pound of steam can be used to generate a little less than 1 pound of vapor through evaporation. 总体来说一磅的水通过蒸发可以产生不到一磅的蒸汽。
They manipulate the water in the xylem under negative pressure -- what's called a metastable liquid state -- right on the verge of becoming a vapor. 但木质部通道的两端都结合有带微孔的膜，这些孔能够阻碍通道中的水超越其表面张力，发生蒸发。
美
['veɪpə]
