释义
〈非正式〉全都知道；直接了解，亲眼看到。
双语例句
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Yes, I have been there before.
是的，我以前去过那儿。
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You may have been there before.
你以前也许去过那里。
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He must have been there before.
他以前一定去过那。
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They have been there before.
他们以前去过那儿。
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I have been there before.
我以前去过那儿。