The complete set of class loaders make up a tree-structured hierarchy with different types of classes loaded at each level.

整个类装入器集合形成了树状结构的层次结构，在其每个层次上都可装入不同类型的类。

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There will be a 30-minute map test at the end of the second week of the course. (Those students joining the course late can make up the map test outside of class with no penalty.)

本课程第二周结束时会有一个30分钟地图测验(较晚选课的学生可以在课外进行地图测验，不扣分)。

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Those repetitions make the application prone to minor errors (e.g., a mis-spelled class name would show up as an hard-to-debug error at runtime).

这些重复使应用易于出错(例如，一个拼写错误的类名可能在运行时显示为一个难于调试错误)。

youdao

And then we're going to try a demo to see if we can convince ourselves that the kind of calculations we make work out perfectly, and we'll do a test up here about half way through class.

然后我们将会尝试演示去看看,是否可以确信我们能够很好的,做出这个类型的计算，我们将在课程中做一个测试。

麻省理工公开课 - 化学原理课程节选

So if you really want class to make a difference in your life, it's up to you.

所以如果你真的想通过这门课改变生活，一切取决于你。

哈佛公开课 - 幸福课课程节选

All these things -- health care security, American manufacturing, rebuilding America and putting construction workers back to work, making sure our kids are getting a great education and can afford college -- all these things that make up a middle-class life, they all tie together.

WHITEHOUSE: The White House

The protesters argue that politicians, too, have ignored kidnapping because its victims make up a relatively small middle-class constituency.

ECONOMIST: Crime in Mexico: Fear of captivity | The

The Senate has already passed a bill that would make sure that middle-class taxes do not go up next year by a single dime.

WHITEHOUSE: President Obama Speaks on the Importance of Extending Tax Cuts for Middle-Class Families | The White House