on ones back

• 朝天； 仰向； 卧病

on ones back的用法和样例：

例句

1. Some rowing boats lay keeled over on the beach.
   一些划艇船底朝天地放在沙滩上。
2. His fist sent the robber sprawling on the ground.
   他一拳把那抢劫犯打得四脚朝天。
3. The old lady had been on her back for two months.
   这位老太太已经卧病两个月了。
4. Jack could not finish his task, because he was laid on his back last week.
   杰克没能完成任务，因为上个星期他卧病在床。