A2 [ C ] UK also cloud [ U ] a grey or white mass in the sky, made up of very small floating drops of water云
More examples
A cloud passed over the sun.
A dark bank of cloud loomed on the horizon.
He puffed a cloud of cigarette smoke into my eyes.
The volcano spewed a giant cloud of ash, dust and gases into the air.
The sun disappeared behind heavy clouds.
B2 [ C ] a mass of something such as dust or smoke that looks like a cloud一团(尘土、烟雾等);云状物
[ I or T ] If something transparent clouds, or if something clouds it, it becomes difficult to see through.(使)变得模糊,(使)变得黯然
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