In a blog post called "First Click Free," Google's senior business product manager Josh Cohen wrote: "Previously,each click from a user would be treated as free.

VOA: standard.2009.12.05

If you click on Courseware you will get to this menu, the first of which preferences is Periodic Table.

如果你点击课件，就会来到这个菜单，第一个选择就是周期表。

麻省理工公开课 - 固态化学导论课程节选

Well first is, you go over here to the right hand side for each one, and it says click here for the full text article.

首先在每份资料的右侧,写着点击获取全文

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选