As the intelligence of robots increases to match that of humans and as their cost declines through economies of scale we may use them to expand our frontiers, first on earth through their ability to withstand environments harmful to ourselves.

【正确答案】正确答案：随着机器人的智能提高到与人的智力匹敌的地步，再加上它们的制造费用随规模效益而下降，我们也许可以用机器人来开拓边远地区，其实首先是利用它们对环境的忍耐力，而那些环境对我们自己是有害的。

【答案解析】解析：句子主干：As…and as…we may use them to…；两个as引导的从句并列作状语；first on earth through their ability to…是介词短语作状语；harmful to ourselves形容词短语作定语修饰environments。