在周期的最后，磁场的两极快速翻转。

At the end of a cycle, the magnetic field rapidly reverses its polarity.

youdao

在周期的后半段，可以尝试戒掉吸烟的习惯。

Try quitting your smoking habit during the second half of your cycle.

youdao

在l上有1%的误差，在周期上有，0。5%的误差，大概是0。02秒。

Since you have a 1% error in l, you're going to have a half a percent error in your period, so that is about 0.02 seconds.

youdao

Well, if we look on the chart, the first ionization energy is what is reported in your Periodic Table.

如果我们查阅图表，一级电离能,已经在元素周期表上标示了。

麻省理工公开课 - 固态化学导论课程节选

if we think about electronegativity as a periodic trend we can just draw our nice periodic table here, and let's separate it into quadrants.

如果我们来思考一下电负性的周期性规律,我们可以把我们漂亮的周期表画在这，然后把它分成四个象限。

麻省理工公开课 - 化学原理课程节选

I thought, well, maybe we can now go to the Periodic Table and figure out what is going on there.

那么接下来，我们可以讲元素周期表了吧,让我们看一下在这儿我们又会遇到什么问题。

麻省理工公开课 - 固态化学导论课程节选