knock characteristic

例句：

1. 1. The ball bounced off the wall and knocked a few shards of glass onto the floor.
   球弹到墙上，把几块玻璃碎片敲到了地板上。
2. 2. The thief knocked over the table and stole all the money.
   小偷把桌子撞翻，偷走了所有的钱。
3. 3. She knocked on the door to ask for directions.
   她敲门问路。