Girls are more likely to speak up frequently and make significant contributions to class.

女生更有可能经常发言，并对班级做出重大贡献。

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The class monitor tried to make up for the mess by reorganizing the class event as students were not interested in the original one.

班长试图通过重新组织活动来弥补混乱，因为学生们对原来的活动不感兴趣。

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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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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

Perhaps most importantly, the middle class has influenced the aims and make-up of the party itself.

ECONOMIST: The other Moore's law | 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