最佳答案
单词fall，意思是：v.落下;跌倒;下落;掉落;跌落;突然倒下;倒塌;下垂;低垂。n.落下;下落;跌落;掉落;(雪、岩石等的)降落;发生;秋天（AmE=autumn）。
例句：1.Evans had rheumatic fever, missed school and fell behind伊万斯得了风湿热，没去上课，功课也落下了。
2.The force of her fall was broken by the straw mats. 草垫的缓冲作用减弱了她下落的冲击力。
3.The house looked as if it was about to fall down. 房子看起来好像就要倒塌似的。