cloud后面不用原形。

n. 云；阴云；云状物；一大群；黑斑vt. 使混乱；以云遮蔽；使忧郁；玷污vi. 阴沉；乌云密布That cloud looks like a cat.那朵云看上去像一只猫。This cloud formation looks like an elephant.这个云的形状看上去像一只大象。A huge cloud of dense smoke stretched across the horizon.一块巨大的浓烟横跨了整片天空。See, every cloud has a silver lining!你看，乌云背后总有一线光明。The plane was flying in cloud most of the way.飞机一路大多在云层里飞行。