The gaseous from of any substance.

【理】汽；气；蒸气。

A cloud-like substance floating in the air and robbing it of clearness, as fog, smoke, etc.

烟雾。

Anything impossible to seize and hold; something that vanishes like smoke or mist.

捉摸不着的东西；空想；虚幻之物。

Melancholy.

忧郁。

To pass off in the from of gas, steam, etc.

蒸发；化为(蒸)气。

To send out gas, steam, etc.

排气；排出蒸气。

To indulge in idle take.

空谈。