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。
Then you're going to get several different looking versions of articles when you click on that particular tab.
之后当你们点击特定的标签,会得到相应不同版本的文章
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