这颗卫星将主要用来转播电视节目。

The satellite will be used mainly to relay television programmes.

《柯林斯英汉双解大词典》

在早期，互联网主要被科学家用来与其他科学家交流。

In the early days, the Internet was used mainly by scientists to communicate with other scientists.

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不管毛发是用来做什么的，也不管它在人体的哪个部位，它都主要由一种叫做角蛋白的蛋白质组成。

Now hair, whatever it is for and wherever it is on the human body, is composed mainly of a protein called keratin.

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OK. Now, that's a nice simple little test, let's look at a couple of other examples to get a sense of what this will do.

好，那么这是一个很好的小测试，让我们看看其他的一些例子,来明白这个主要用来做什么的。

麻省理工公开课 - 计算机科学及编程导论课程节选

Well, there are four principal ways that composers signal to us the whereabouts of the down beat.

以下有四条主要途径,是作曲家用来告诉我们重拍在哪里的

耶鲁公开课 - 聆听音乐课程节选