across, cross是横过的意思，across是介词,通常在用go, run, swim. 等搭配；cross是动词,通常可以直接放在句子中；through是穿过，跟across一样是介词,通常在用go, run, swim.等搭配through与cross的不同在于：through是 “从中（内部）通过”；across是从事物表面穿过; over(介词) “在……上面过”。 (1) across (介词) “横过，穿过”，指从……的一边到另一边. Eg: I went across the road = I cross the road. 我横过马路(经斑马线) (2) cross (动词) “穿过” (3) through （介词） “穿过，通过”，指穿过两边（从内部）。We walked through the forest. (4) over(介词) “在……上面过” eg: a bridge over the river 横跨河面的桥 本文来源：https://www.wddqw.com/doc/5cbc12c76f1aff00bed51ecf.html