through 是介词，pass与cross 是动词。pass through, pass by 穿过,通过cross over 越过房间内用in the corner墙角外用on the corner如：Sheput his face in her hands sitting in the corner of her room. The guys stood on the corner of the street smoking cigarettes.另外，如果在空地上有一堵墙形成一个角，那么，在角内用in the corner，在角外用on the corner。
