fall
v.落下;下落;掉落;跌落;突然倒下;跌倒;倒塌;下垂;低垂
n.落下;下落;跌落;掉落;(雪、巖石等的)降落;發生;秋天
1.
Totally exhausted, he tore his clothes off and fell into bed
他疲憊至極,扯下衣服,壹頭倒在床上。
柯林斯高階英漢雙解學習詞典
2.Output will fall by 6%產量將減少6%
fell down
(向下遊)流下;〔美俚〕失敗;跌倒;同“fall”
1.house fell down.
房子倒塌了。
2.
He fell down and injured himself.
他跌傷了。
相比之下,突然的摔倒用fell down更合適