分析方法：語境與 字面
抓住 down off away 三者的區(qū)別
fall down

倒塌; 跌倒
Many buildings fell down during the earthquake.
在地震中許多樓房倒塌了.
失敗
His plans have fallen down.
他的計(jì)劃失敗了.
fall off
跌落, 滾落下
When you are learning to ride a bicycle, you often fall off.
初學(xué)騎自行車時(shí), 常會(huì)從車上掉下來.
突然降低; 向下斜
The land falls off here towards the river.
這兒的地勢(shì)朝河的方向低了下去.
減少
The number of passengers by this line fell off slightly in January.
一月份這條航線的乘客數(shù)量略有減少.
變壞; 惡化
The cooking fell off remarkably.
烹飪質(zhì)量大大降低.
逐漸消失, 死亡
Words fall off by disuse.
詞不用就會(huì)成為廢詞.
不再支持; 叛離
His friends fell off one by one.
他的朋友一個(gè)一個(gè)地跟他疏遠(yuǎn)了.
變瘦; (健康、精力等)衰退
He took care to keep the cattle from falling off.
他精心照料著牛群, 不使它們瘦下來.
fall away
離開
All his old friends fell away from him.
他的老朋友全都離開了他.
消瘦
You'd scarcely believe anybody could fall away so rapidly.
你簡直難以相信一個(gè)人會(huì)消瘦得這么快.