they are walking over the bridge 为什么不用'on the bridge' on 在....上面 与物体接触了 over 在...之上 不与物体接触 难道人在桥上走不用与桥面接触地吗？

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they are walking over the bridge 为什么不用'on the bridge' on 在....上面 与物体接触了 over 在...之上 不与物体接触 难道人在桥上走不用与桥面接触地吗？
they are walking over the bridge 为什么不用'on the bridge'
on 在....上面 与物体接触了 over 在...之上 不与物体接触
难道人在桥上走不用与桥面接触地吗？

they are walking over the bridge 为什么不用'on the bridge' on 在....上面 与物体接触了 over 在...之上 不与物体接触 难道人在桥上走不用与桥面接触地吗？
这是新概念英语的一个小语法点.针对你的问题,我做出如下解释：
首先,they are walking over the bridge 和
they are walking on the bridge都是正确的.
over 有“穿过,在.之上（不接触表面）”的意思.句中的over是“穿过”的意思.所以用Over 会更好.
如 go over,fly over,动词和Over搭配非常常见.
【如：
The aeroplane is flying over the river.
飞机正在河上飞过.
The birds are flying over the house.
鸟儿在屋上飞过.
over还可表不“在……上方”（不接触表面）,如：
The sky is over our heads.
天空在我们头顶上.】
On有“在...上面”,静态意思.缺少over的动态“穿越”之意.
所以,非常严格的来讲,they are on the brige(他们在桥上）,they are walking over the brige（他们在过桥）.是正确的.

They are walking over the bridge.他们正在过桥。
句中的over有“穿过”的意思。又如：
就像：The birds are flying over the house. 鸟儿在屋上飞过。

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