fall in片语动词KK [fɔl ɪn] /fɔl ɪn/发音片语动词1掉进去、落水He leaned too far over the pond and fell in.他身子往池边探得太出去,结果掉了进去。2塌陷、倒塌、坍下来The roof of the old barn fell in after weeks of rain.连下了几周的雨,那座旧谷仓的屋顶塌了下来。3集合、列队军事The soldiers fell in quickly when the order was given.命令一下,士兵们迅速集合列队。4跟上、走在后面She fell in beside me and we walked to the station together.她跟到我身边,我们一起走去车站。用这个字练口说→