为什么这里用“the back of”?Publishing houses are now making considerable profits on the back of new children's books.这里the back of 有没有具体意思?有没有其他的这类用法?

为什么这里用“the back of”?Publishing houses are now making considerable profits on the back of new children's books.这里the back of 有没有具体意思?有没有其他的这类用法? in two days i was again back on the outskirts of london这里OUTSKIRTS为什么用复数而不用单数呢 关于过去试与词组1、 The price of gold climbed back? 为什么这里用过去式?2、The dog is running after a cat.这里的是run after词组么? We had better go back to the station now, 这里为什么用to I drove back on to the road.这里为什么用to呢? before the closing of the store为什么这里要用closing?closing 在这里是什么词性? 英语翻译he's the guy in the red suit who rides the back of the Santa Train from.to.尤其是里面 ride the back of the Santa Train看不懂为什么要用back at the back of 怎么用 back-of-the-envelope on the back of Back of the sit at the back of the back sit at the back of the back the thought of going back home was ______kept him happy while he was working aboard 这里为什么不能用WHAT 只能用THAT He seemed to be in need of company,for he suddenly went back into the house请问这里的副词为什么放在动词前 She always stands in the wind_____for you back from school.答案是waiting ,为什么?我认为这里应该用to wait . She is the tallest of the three girls.这里为什么不用in,而用of? nothing is left 【of】the house after the fire 这里介词为什么用of呢