Throughout the class, starting next week, we'll take what I called, " "time-ins" as opposed to "time-outs".

在这整个课程中，从下周开始，我们将进行我所说的，“练习时间“，而不是“休息时间。

哈佛公开课 - 幸福课课程节选

And again, I want you to have practiced drawing these out in the form you always need to start with the sigma and then write the number of the orbital.

同样的，我希望你们,练习画这种图,你总是要从sigma开始,然后写出轨道数目。

麻省理工公开课 - 化学原理课程节选