（1）Let's walk through the park.
(2) Let's walk across the park.
上面的两个句子都是正确的。这是否意味着 through 和 across 可以互换？
一般说来, through 和 across 是不能互换的, 因为 across 是指“通过某一平面”, 例如, across the ice(通过冰面), across the square(通过广场), across the road(穿过马路), across the street(穿过街道), 而 through 则是指“通过某一个三维空间”, 例如, through the crowds(穿过人群), through the forest(穿过森林), through the pipe(穿过管子), through the window(通过窗户)。你所提出的句(1)之所以能使用 through, 是因为可以把 park 看作一个三维空间的缘故。请对比下列实例:
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He wandered across Hyde Park. (EED) 他在海德公园漫步。
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A smile of pleasure passed across his face. (Wilde) 满意的微笑掠过他的面孔。
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Water flows through this pipe. (LEG) 水从这个管子流出来。
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We walked through the village. (Eckersley) 我们穿过了这个村子。
当把 street 看作一个三维空间时,也可以与 through 连用:
On our way we had to pass through Hudson Street. (Doyle) 在我们去的路上必须经过赫德森街。