crack out laughing

• 发笑

crack out laughing的用法和样例：

例句

1. We are laughing at the clown's silly antics.
   我们因小丑笨拙的动作而发笑。
2. Jane looked serious, but I knew she was laughing up her sleeve.
   简看上去一本正经，但我知道她在暗自发笑。