fell down 和come down 的区别

fall down 是 倒塌; 跌倒 跟 失败例句：Many buildings fell down during the earthquake. 在地震中许多楼房倒塌了。 Babies often fall down when they learn to walk.婴儿在学走路时经常摔倒. His plans have fallen down.他的计划失败了。come down 是 下来 倒下 下落 ==例