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Before getting to abstractions, let's look at the e-mail I got from my milkman.
在进入抽象的讨论之前,还是让我们首先来看一看我的送奶工发来的电子邮件吧。
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Modularity implies abstractions.
模块化暗示着抽象。
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What are the abstractions?
都有哪些抽象?
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Both should depend on abstractions.
他们都应该依赖于抽象。
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Details should depend on abstractions.
细节应该依赖于抽象。