You're going to have three classes that all map back to the same table, so you need a way to keep each class uniquely named. (This is something that is not likely to happen in a real application.)

因为将会有三个类全部映射回相同的表中，因此需要有一种方式来将每一个类单独命名(这在真实的应用程序中不大可能会发生)。

youdao

This content is fetched from the Internet, so it is updated every time you visit the page and can provide real value in aggregating all the useful product updates in one easy location.

此内容来自 Internet，因此每次访问页面时都会更新，能够获得在一个方便的位置聚合所有的有用产品更新的真正价值。

youdao

How many times have you watched a movie and wondered: is this landscape real? Does this amazing place even exist? And if so, where the heck is it?

你是不是也曾因为一部电影，爱上一处风景？如果可以亲身去到那些电影里真实存在的场景，应该会炒鸡激动、炒鸡开心吧！

youdao

This is real, unlike the Joule coefficient which is very small so that most gases have tiny Joule coefficients. So if you do a Joule experiment, you hardly measure a temperature change. With real gases, here you do actually measure it. You can feel it with your finger on your bicycle tire.

系数那样小以至于,大多数气体的焦耳系数,都很小，所以如果你做焦耳实验,很难测量出温度的变化,对于真实气体，你可以测量它，你能通过手指按在,自行车轮胎上来感觉到它。

麻省理工公开课 - 热力学与动力学课程节选