across and over

    The prepositions across and over are often used with similar meanings, but there are some differences.
介词across和over经常使用而意思接近，但是有些不同。

1   They can both be used to mean 'on or to the other side of a line, river road, etc' (position or movement related to things that are 'long, and thin').
二者用来表示‘on the other side of a line（在对面）’或‘to the other side of a line（到对面）’
       We walked over/across the road. （我们走到马路对面）
       See if you can jump over/across the stream.（看你是否可以跳到小河对面）
       His room's just over/across the corridor.（他的房间正好在走廊对面）
       We'll be over/across the frontier by midnight. （午夜我们会到边境对面）

     Over is used for movements on or above water, but not in water.
over用来表示在水面或水面上方的移动，而不是在水里。
       How long would it take to swim across the river? (Not: *... over the river?)
游过这条河要多长时间？（不是：*... over the river?）

2  Both across and over can mean'on the other side of' a high barrier (like a hedge, a fence, a wall, a mountain range), but only over is used for a movement to the other side of something high.
across和over两者可以表示‘在’隆起的障碍的‘那边’（比如：树笆，栅栏，墙，群山

），但是只用over表示‘到’隆起的障碍的‘那边’的移动。

Compare:
比较：
        If we can be over/across the fence before sunrise we've got a chance.

（太阳出来前要是能翻过栅栏，我们就有机会了。）
        When I last saw him he was climbing very slowly over the fence.（我上

次看见他时，他正在慢慢攀过那栅栏。）
        (Not: *... across the fence.)

 3  Both across and over can be used for movement inside an area (for example

fields, a desert, a dance-floor).
across和over可以用来表示在一个平面内的移动（例如：田地，沙漠，舞台）

        Who are those people wandering over/across the fields?（那些在田里漫步的人是谁？）

     However, when we mean 'from one side to the other of the area', we only use across.
可是，要表达‘从一端到另一端’，只用across

        It took him six weeks to walk across the desert. (Not: *... over the desert.)（他用六周穿越了那片沙漠）（不是：*... over the desert.）
      And over is not normally used for movement in a three-dimensional space (like a room).
在立体的空间（如室内）的移动，不用over
        He walked across the room, smiling strangely. (Not: *... over the room ...)他穿过房间，笑得奇怪。（不是：*... over the room ...）

 4  Note that the adverb over has a wider meaning than the preposition over.

You cannot say *Let's swim over the river to the church, but you can say Let's swim over to the church.
注意：副词over比介词over的意思多些。不能说‘*Let's swim over the river to the church,’但是可以说‘Let's swim over to the church.’（让我们游到教堂）

没想到，我的这篇博客文章被‘在线英语词典’盗版了