across,through,over,cross区别和用法
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across (介词)横过,穿过,指从……的一边到另一边

I swam across the river.

through (介词)穿过,通过,指穿过两边(从内部).We walked through the forest.

cross (动词)穿过

over(介词)在……上面过I walked over the river.(指从桥上过)