• 1. knock at: 敲 | 敲门 | 门 | 敲击
• 2. to knock at the door: 敲门 | 叫门
• 3. a knock at the door: 敲门声 | 一个敲门声

更多释义

• 1.They heard a knock at the front door.
  他们听到前门有一敲门声。
  dict.yoduao.com
• 2.They were interrupted by a knock at the door.
  他们被敲门声打断了。
  dict.yoduao.com
• 3.Late that evening, there was a knock at the door.
  那天深夜，有人敲过门。
  dict.yoduao.com

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