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。
For example, if it's more convenient should you change the environment to make the unhealthy food less convenient and make healthy foods more convenient?
举例来说,如果是因为方便,那你改变外部环境,会使得健康食品比垃圾食品更容易获得吗
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