across, cross, through, over. Across 和through 作为介词都有“穿过”的意思，用法有所不同。 Across 表示在某物体的表面上横向通过，后面接street, bridge, desert, road等词。 She swan across the channel. Though 表示动作是在某物体的空间通过，后面接gate, forest, window, vally, desert等词。 The train went though a tunnel. 火车穿过隧道。 Cross 动词。“穿过”。 They crossed the river on rafts. 他们乘筏渡过河去。 Over 介词。 指“越过”高的障碍物。 He was already over the gate waiting for me to climb over. Past 介词。 表示从旁边“经过”，相当于by. It was past midnight when we got home. 本文来源：https://www.wddqw.com/doc/75c0ccb2f41fb7360b4c2e3f5727a5e9856a271e.html