英语翻译We knew the going back and forth wasn't going to cut it

going back and forth：为一固定用法,意思是“来来回回”；加上定冠词 就是一个“名词短语”,要作为一个独立的名词看待。即：the going-back-and-forth 。We knew（that） the going-back-and-forth wasn't going to cut it any more。中间省略了that ,后面是宾语从句,the going-back-and-forth为宾语从句的主语。cut：在这里为：“与…相交；与…相切；穿梭”的意思。We knew the going back and forth wasn't going to cut it any more。“我们知道：不能再这样来来回回继续穿梭下去了。”直译就是：我们知道：这种“来来回回”再不要继续穿过来穿过去了。it =the going-back-and-forth明白了吗?