on his back的用法和樣例：
例句
- The tramp carried his belongings in a pack on his back.
那個流浪者把所有的東西捆成一包背在背上。 - He said in a low voice, both his hands (being) on his back.
他低聲地說，他的雙手放在背後。 - The burden on his back seemed to be crushing him to the earth.
他背上的重負似乎要把他壓倒在地。 - The traveler took out a bottle of water from the pack on his back.
那位旅行者從他的背包中拿出了一瓶水。 - I saw weals raise on his back.
我看到鞭痕從他背上隆起。 - He lay on his back and looked up at the sky.
他仰卧著觀看天空。
