n.憂郁

A cloud is a condensation of water vapour. 云是由水蒸汽凝縮而成的。

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

Water can be changed into vapour when heated. 水被加熱時，可以變成水蒸汽。

His brain was clouded by vapours and dreams. 他的腦子里充滿空想和夢幻。

It can change water into vapour. 它能把水變成蒸汽。

The sun exhales vapours from the sea. 陽光使海水蒸發(fā)。