The best way to reduce the number of traffic accidents is to make all young drivers complete a safe driving education course before being licensed to drive.

减少交通事故的最佳方法是，让所有年轻驾驶员在获得驾驶执照之前，先完成安全驾驶培训课程。

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They trained 99 volunteers to complete a virtual maze as quickly as possible.

他们训练了99个志愿者尽快地完成一个虚拟迷宫。

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Look for time when you complete a unit of study in any of the subjects.

留意一下你完成任何一科的一个学习单元的时间。

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So if we have total +2 and complete shielding -1 where that can actually negate a full positive charge, because remember our nucleus is plus 2, +1 one of the electrons is minus 1, so if it totally blocks it, all we would have left from the nucleus is an effective charge of plus 1.

抵消一个完全的正电荷,因为记住我们的原子核是,其中一个电子是,所以如果它完全挡住了它，我们从原子核中留下的，全部有效电荷就是，所以，在我们的第一个例子中,我们的第一种极端情况。

麻省理工公开课 - 化学原理课程节选