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- 警惕性是万万不可放松的。
You cannot afford to relax your vigilance for a moment.
- 她不可能如此迟钝。
She cannot possibly be so obtuse.
- 你不可因一个人贫穷而轻视他。
You must not despise a man because he is poor.
- 我不能不可怜他。
I cannot but pity him.
- 他不可能感冒,因为当天我还看到他跟玛丽跳舞。
He cannot have caught a cold, because I saw him dancing with Mary the same day.
- 这封信不可能是她自己写的。
She cannot have written the letter herself.
- 他是个老实人,所以他不可能偷了我的钱。
He is honest, so he cannot have stolen my money.
- 她反复地给孩子们说,他们不可以独自横过马路。
She drummed it into the children that they must not cross the road alone.
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