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knock
英/nˈɒk/
美/ˈnɑk/
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01n.
敲, 敲打, 敲门
the sound of knocking (as on a door or in an engine or bearing); negative criticism; a vigorous blow; a bad experience
02v.
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the sound of knocking (as on a door or in an engine or bearing); negative criticism; a vigorous blow; a bad experience