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cloud是可数还是不可数名词

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cloud是可数还是不可数名词
字典上写的很清楚既是可数又是不可数,我只是想让各位给我举个例子,什么时候可数,什么时候不可数
cloud是可数还是不可数名词
cloud既是可数也是不可数
1 WEATHER [C,U] a white or grey mass that floats in the sky,made of small water drops
rain/storm clouds
The entire region is covered in thick cloud.
2 DIRTY AIR [C] a mass of gas or very small pieces of something floating in the air
a cloud of dust/smoke
3 be under a cloud
If someone is under a cloud,they are not trusted or not popular because people think they have done something bad.
It is sad that he must end his career under a cloud.