on ones back的用法和樣例：
例句
- Some rowing boats lay keeled over on the beach.
一些劃艇船底朝天地放在沙灘上。 - His fist sent the robber sprawling on the ground.
他一拳把那搶劫犯打得四腳朝天。 - The old lady had been on her back for two months.
這位老太太已經(jīng)臥病兩個(gè)月了。 - Jack could not finish his task, because he was laid on his back last week.
杰克沒(méi)能完成任務(wù)，因為上個(gè)星期他臥病在床。
