请选择我们，为您设计您自己的花果茶！

Try us to design your own exclusive fruit or herb tea!

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请选择我们的服务，了解我们怎样帮您构思，打造和完善您的硕士研究生入学申请文书。

Choose one of our services and learn more on how we can help you organize, develop, and polish your graduate school application essay.

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请不要选择该选项，因为简单回归只能有一个变量，而我们有六个变量。

Do not choose this because simple regression only looks at one variable, and we have six.

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So let's do a quick clicker question, and you tell me how many valence electrons does fluorine have? Remember, valence electrons are different from core, they're only the outer-most electrons in the outer-most shell.

那么让我们来做一个小选择题，请大家来告诉我,氟有多少个价电子，要记得，价电子与芯电子不同，它们是在最外壳层的最靠外面的电子。

麻省理工公开课 - 化学原理课程节选