1.  a knock on the door
2.  a knock at the door

• 1. 敲门声: Knock on the door | tap-tap | Knock | a knock at the door
• 2. 夜半敲门声: Knock-knock
• 3. 敲敲敲门声: Knock knock knock

更多释义

• 1.他们听到前门有一敲门声。
  They heard a knock at the front door.
  dict.yoduao.com
• 2.他们被敲门声打断了。
  They were interrupted by a knock at the door.
  dict.yoduao.com
• 3.敲门声大作。
  There was a sharp knock on the door.
  dict.yoduao.com

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