This paper proposes the method of decision-tree SVM on two levels pyramid image, it could solve the segmentation problem of multi-classes objects on aerial image.

提出了两级金字塔影像上的决策树支持向量机方法，解决航空影像中多类地物的分割问题。

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The solar system also has two analogous classes of objects, smaller than planets—namely, asteroids and comets.

太阳系也有两类类似的物体，比行星还小——即小行星和彗星。

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What are classes and objects?

什么是类和对象？

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PROFESSOR: Last time, Professor Guttag introduced the idea of objects and classes and this wonderful phrase called object-oriented programming.

教授：上节课，Guttag教授,介绍了对象和类的概念以及,面向对象编程这个美妙的短语,这是我今天想继续讲的一个话题。

麻省理工公开课 - 计算机科学及编程导论课程节选

What we're really doing, or I shouldn't say what we're really doing, a basic piece of what we're doing, when we talk about classes or objects, is we're doing something that Professor Guttag mentioned, we're defining an abstract data type.

或者我不应该，说我们真正要做的，当我谈到类或者对象的时候，我们在做的基本的东西，如Guttag教授提到的,就是定义一个抽象数据类型，那么这到底是什么意思呢？

麻省理工公开课 - 计算机科学及编程导论课程节选

Once you've got the hang of it, cutting through the jargon of Auras, Happenings and Anywheres - the different classes of objects you create - then it is impressive.

BBC: Aurasma: Augmented reality future or forgettable fun?

Fast forward twenty years, and to walk the streets of any city in the U.S. is to see Americans of all income classes listening to music, texting, searching internet sites, and watching television on small rectangular objects that also serve as the once much coveted wireless phone.

FORBES: The Life Enhancing, Unrelenting Brilliance of Income Inequality