fell back的用法和樣例：
例句
- Luckily she fell back on grass or she might have hurt her head.
幸好她是向後倒在草地上，不然就會傷著頭。 - Mary read the letter and almost fell back wards, reeling from shock.
瑪麗讀完信，由於震驚她站立不穩，幾乎向後倒了下去。 - The enemy fell back as our troops advanced.
我軍前進，敵軍後退。 - His eyes glazed over and he fell back unconscious.
他的雙眼變得獃滯無神，接著身體往後倒下便不省人事了。
