英语的on和over的区别是什么?新概念一33课里有一句They are walking over the bridge

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英语的on和over的区别是什么?新概念一33课里有一句They are walking over the bridge.over为什么不是on?

walk over the bridge是固定短语,意思是过桥.课文中也是这样翻译的.
on指与物体表面有接触,如书在桌子上：The book is on the desk.而over指相隔一段距离,而且通常是垂直向上,如桥横跨河面：The bridge is over the river.

英语的on和over的区别是什么?新概念一33课里有一句They are walking over the bridge they are walking over the bridge其中over的问题 They are walking over the bridge. 会英语的大师来帮帮忙,They are walking over the bridge.中ov they are walking over the bridge 为什么不用'on the bridge' they are walking over the bridge 为什么不用on the bridge 新概念英语求答案They are walking over the bridge.（改为否定句）Shlly is loo They are WalKing over the bridge.(划线提问)They They are walking over the bridge. 主语They 谓语 are walking 那么ov who are walking over the bridge? they are walking over the bridge中的over改成across有没有问题? they are walking over the bridge为什么不是across the bridge?