This is old data now, from 1995, but I don't think it's changed very much.

这是个很久的数据了,来自一九九五年,但我不认为这会有多大改变

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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。

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