knockbal

例句：

1. 1. The doorbell rang, and she knocked on the door to see who was there.
   门铃响了，她去敲门看是谁。
2. 2. He knocked on the door gently, hoping to catch her attention.
   他轻轻敲门，希望能引起她的注意。
3. 3. She knocked back the drink with a smile, feeling relaxed after a long day.
   她微笑着把饮料一口喝下，感觉一天工作后放松了许多。