belly up

例句：

1. 1. She lay down on the couch and closed her eyes.
   她躺在沙发上闭上眼睛。
2. 2. The man lay flat on his back, motionless.
   那个人平躺在地上，一动不动。
3. 3. He sat on his belly and dug in the dirt.
   他趴在地上挖土。