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

The sources are: one,the plasmid vector that we've picked, and the second is these genes that for some reason we're interested in.

第一个是我们选择的质粒载体,第二个是我们感兴趣的基因

耶鲁公开课 - 生物医学工程探索课程节选

Can you go ahead and take 10 more seconds on this first clicker question here? OK.

大家先来花十秒钟的时间,把第一个选择题做了好吗？好。

麻省理工公开课 - 化学原理课程节选

Here's our first question: what's the right thing to do?

下面是我们的第一个问题：,何为正确的选择？

耶鲁公开课 - 公正课程节选

One answer is kin selection.

第一个答案是亲缘选择。

耶鲁公开课 - 心理学导论课程节选