n.蒸汽；水蒸汽

v.蒸發(fā)；汽化

The locomotive vomits out vapor when getting started. 火車頭啟動(dòng)時(shí)噴出大量蒸汽。

A cloud is a mass of vapor in the sky. 云是天空中的水汽團(tuán)。

Warm air can contain more water vapor than cold air. 熱空氣要較冷空氣容納更多的水蒸汽。

Topically, 1 pound of steam can be used to generate a little less than 1 pound of vapor through evaporation. 總體來(lái)說(shuō)一磅的水通過(guò)蒸發(fā)可以產(chǎn)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. 但木質(zhì)部通道的兩端都結(jié)合有帶微孔的膜，這些孔能夠阻礙通道中的水超越其表面張力，發(fā)生蒸發(fā)。

Water vapors in the hot sun. 水在炎熱的陽(yáng)光下汽化。