you look at through a train window这句话为什么要加个at呢? 去掉at不行吗 怎么能同

you look at through a train window这句话为什么要加个at呢? 去掉at不行吗 怎么能同 I look out the window at the train.对吗 I look out the window at the train. You should look at it yourself这句话yourself 前为什么不加by I'll look at all the snow through the window.through在这里又什么意思 为什么look at sth不能用look sth at 英语翻译Mr Fool is at the window of a train at a station.Mr Fool Have a look at that man -----you pass him 为什么不填when而填as 看比赛能不能用look at We can sit on the train (look out at)the beautiful views这句话有 look at those sheeps?这句话为什么不对? look at you