短语词组短语fall back upon 回过来再谈;求助于;撤退到fall in upon 意外地遇到;顺便访问Fall Down Upon One 's Knees 伏地跪拜fall upon the ears 被某人听见You fall upon me 你落到我身上fall upon sb 降临到某人身上fall upon the ear 被某人听到;传到某人的耳朵fall upon the steps 扑倒在台阶上 返回 fall upon