尽量详细一点喔
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)
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)
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