Unlike the case for energy like you've seen in lots and lots of disciplines, where you can arbitrarily set the zero in a way that makes it convenient for you.

通过无数的练习题,你们已经看到这和能量不同，对于能量我们可以任意确定,能量的零点。

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because it’s such a convenient, such an easy way to keep in touch with everybody.

因为这个真的可以很方便地跟大家保持联系。

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and it's a really convenient way to keep in touch with them.

这样联系他们真的很方便。

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Renting a car is cheaper and more convenient.

租车要便宜得多，也方便得多。

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It’s such a convenient way

真的很方便，

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But what we will find is, it's more convenient to lump these two numbers into a single entity, which is called a vector.

但我们会发现,将两个数值看作一个整体会更方便,我们称之为矢量

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