how to use表示怎样使用sth，后面可以加某件事物/物品等。
例句：
1、In the measure that you learn how to use water to cultivate,then you're going to be able
to spread beyond the Nile.
了解到如何用水来灌溉农田后，你还要能够把尼罗河水抽取上来。
2、It is also easy to demonstrate to my students,and I have taught them how to use it in term projects.
它还很容易向我的学生示范，并且我已经教授了学生如何在学期项目中利用它。
