knock-on effect

常见例句

• When I fell I got a terrible knock on the head.
  我摔倒时头撞得很厉害。
• Jim sat up when he heard the knock on his bedroom door.
  吉姆听到敲寝室门的声音时便坐了起来。
• Knock on the door before you enter.
  进屋之前要先敲门。
• I heard footsteps, then a knock on the door.
  我听到脚步声，随后是敲门的声音。
• When I fall I get a terrible knock on the head.
  我摔倒时头撞得很厉害。
• He got a nasty knock on the head when he fell.
  他跌倒时头撞得很厉害。
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