I can see people from as far as 100 meters.
我可以看到百米之外的人。

as…as…意为"和……一样"，表示同级间的比较。其中，第一个as为副词，第二个as为连词。一般可以用as+ adj./ adv. +as…。例如：

This film is as interesting as that one (is).
这部电影和那部电影一样有趣。

文中的As far as作短语介词或连词，后跟名词或从句，意为“像……那样远”、“远到……”、“直到……”，强调至某一指明地点或距离。在否定句中，也可用so far as.我们还可以说：

You can see as far as the coast.极目远眺，你可以看到海岸。

She didn’t go as far as the others (did).她走得不像其他人那样远。

As far as 还可以作从属连词，意为“就……来说”、“在……范围内”，引导状语从句，强调程度或范围，从句中动词常用know,see,concern等，相当于so far as.如：

As far as I know,he has been abroad .据我所知，他已经出国了。
As far as I’m concerned,I’d like to go swimming.就我来说，我想去游泳。

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