Clouds are formations of condensed water vapour.

云是由凝聚的水蒸气构成的。

His brain was clouded by vapours and dreams.

他的脑子里充满空想和梦幻。

According to the engineering thermodynamic theory,the inflating work and ebulliency work exerted by the materials composed of liquid,vapour and gas during the adiabatic process are calculated.

运用工程热力学的算组成物料的各气体、体、液体于绝热过程中对外所作的膨胀功、爆沸功。