vapors

n.蒸汽；水蒸汽

v.蒸发；汽化

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。

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。

Water vapors in the hot sun. 水在炎热的阳光下汽化。