设置交换机管理ip地址:through和over的不同

through, across和over的区别
①、through：穿过
I threw it through the window.
Is it quicker to drive round the town, or straight though the centre?
②、across: from one side to the other
（在平面上）越过，在/到……对/面，横过。
I can’t swim across the river.
我不能游到河对岸。
He went across the hall to the door.
他越过大厅到门口。
③、over: 翻越过
across和over两者都表示从一侧向另一侧的运动：
She drove over /across the bridge.
但如果越过的是一个高的物体，则用over:
He climbed over the wall.
如果越过的是一个平面，则宜用across：
He went across the hall to the door.
across和through都表示“穿过”，“通过”的意思，across表示从物体表面“穿过”、“通过”;而through则表示从内部“穿过”、“通过”。
by 的用法

介词，表示通过…方法或途径的意思，译成“靠，通过”，后面可加名词或名词短语。

e.g. 1) The house was destroyed by fire. 房屋被火烧毁了。

2) travel by air /land/sea. 航空（陆路，航海）旅行

3) go by train /boat/ bus 乘火车（船，公共汽车）去

4) shake sb. by the hand 和某人握手

5) I study English by watching English movies. 我通过看英文电影学英语。

另外，by作为介词的意义有很多，我们也已经学过一些用法，总结如下：

1）在…旁边，靠近 e.g. There is a power station. 河边有一个电厂。

2）沿着，经由 e.g. come by the highway 由公路来

3）由于 e.g. by mistake 由于差错

4）被，由 e.g. some articles written by Lu Xun. 一些由鲁迅写的文章

5）表示面积 e.g. a room 5m by 4m 一间长五米宽四米的房间

6）逐批 e.g. one by one 一个接一个
They swam across the river. 他们游过河去。
They walked through the forest. 他们走过森林。

through：穿过

I threw it through the window.

Is it quicker to drive round the town, or straight though the centre?

over: 翻越过
across和over两者都表示从一侧向另一侧的运动：

She drove over /across the bridge.

但如果越过的是一个高的物体，则用over:

He climbed over the wall.

如果越过的是一个平面，则宜用across：

He went across the hall to the door