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Can
Can强调表达能力ability:
I can climb that mountain in 5 hours. 这里can 强调身体能力，因此可以与 be able to互换：
I am able to climb that mountain in 5 hours.
Can 的否定式= can't :
The old man can't see without his glasses.
可能性 possibility. 可以怎样，会是怎样：
The weather can be very hot in Delhi.
可行性：
If it rains, we can hold the party indoors.
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