Itisgoodtoforget.
摔倒的英文是tumble音标[t^mbl]其他意思v.滚落,翻滚下来 n.暴跌,混乱的一堆，杂乱不堪的一团造句A sudden braking tumbled him down
济南李大妈
fall behind 1.落后,跟不上. Some students become depressed because they fall behind. 一些学生因为落后而变得抑郁（消沉）. fall over:摔倒. If I walk too quick I will fall over. 如果我走得太快,我会摔倒.
