n. any collection of particles (e.g., smoke or dust) or gases that is visible
n. a visible mass of water or ice particles suspended at a considerable altitude
n. out of touch with reality
n. a cause of worry or gloom or trouble
n. 云, 阴暗, 烟雾, 疑团
vt. 以云遮敝, 笼罩, 使黯然
vi. 乌云密布, 阴沉
1. The cloud in the sky looks like a fluffy cotton ball.
天空中的云看起来像一个蓬松的棉花球。
2. I saved my documents on the cloud so I can access them anywhere.
我把文件保存在云端，这样我可以随时随地访问它们。
3. When it rains, the clouds turn dark and heavy.
下雨时，云变得又黑又沉。