动词短语
中文翻译：阀门撞击同义词
同义词：
['knock on thevalve', 'bang on the valve']
例句：
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1. The valve was so tightthat it wouldn't budge.
阀门太紧了，无法移动。
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2. He knockedon the door to ask for directions.
他敲门问路。
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3. The car's enginehad a knocking sound when it started.
汽车启动时发出敲击声。