through,空间上的穿过,常见搭配look through the window, go through the tunnel, through the forestacross,物体表面的穿过,有横渡的意思 swim across the riverpast为经过,走过,go past the library.
through,是介词，要和动词连用，从内部的穿过,lookthroughthewindow,gothroughtheforestacross,是介词，要和动词连用，物体表面的横穿过,有横渡的意思swimacrosstheriver，past是介词，要和动词连用，从旁边经过,走过,gopastthelibrary.
