passing flatus

例句：

1. 1. He passed gas loudly in the car, causing everyone to giggle.
   他在车里放屁声音很大，让每个人都笑了。
2. 2. After eating too much, he had to pass gas several times.
   他吃得太多，不得不几次放屁。
3. 3. The old man passed gas loudly and uncontrollably, making everyone uncomfortable.
   老人放屁声音大且无法控制，让大家都感到不舒服。