事件添加了一个抽象的抽象层和对委托的保护，这种保护防止委托的委托造成重置委托以及调用列表。

Events adds a layer of abstraction and protection on delegate, this protection prevents client of the delegate from resetting the delegate and invocation list.

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他们从抽象的思想开始，讨论它，相互提醒着在匆忙事件中被遗忘的另一个抽象概念。

They began with abstract thought, discussed it, reminded each other of another abstract point forgotten in the rush of events.

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帮助跟踪抽象：它应当可能由较低层次的抽象层跟踪到较高层次的抽象层。

Helps trace abstractions: It should be possible to trace lower levels of abstractions to higher levels.

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Like the moon, Satan may look beautiful, but upon a closer scrutiny that beauty begins to yield certain metaphysical flaws.

像月亮那样，撒旦看起来非常美好，但是近看,就会发现这份美丽开始显露出一些抽象的瑕疵。

耶鲁公开课 - 弥尔顿课程节选

Now these ideas of classes, object-oriented programming, data abstraction, are about 40 years old, they're not new ideas.

面向对象编程的概念，数据抽象的概念，都是40年前就有的老东西了。

麻省理工公开课 - 计算机科学及编程导论课程节选

Why this struggle, and why must Milton struggle with such awkward metaphysical categories in order simply to address properly the power of light?

为什么弥尔顿必须,与这样一个奇怪的抽象的东西斗争,仅仅是为了恰当的描述光明的力量？

耶鲁公开课 - 弥尔顿课程节选