动词短语
中文翻译：敲门
同义词：
['knock on the door', 'tap on the door', 'ring the doorbell']
例句：
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1. He knocked onthe door and asked for an audience with the king.
他敲门并请求与国王见面。
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2.The old man knocked on the door to ask for some help.
老人敲门寻求帮助。
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3.She knocked on the door and announced her arrival.
她敲门并宣布自己的到来。