knock at the door
释义
敲门：轻敲门以示进入或引起注意。
例句
1·I was wakened by a knock at the door .
敲门声把我吵醒了。
《牛津词典》
2·They were interrupted by a knock at the door .
他们被敲门声打断了。
《牛津词典》
3·You're supposed to knock at the door and wait before entering the office.
进办公室之前，你应该先敲门然后等着。
同义词
敲门；把……撞倒；撞墙
knock on the doorknock out sb
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