Why abstract classes instead of interfaces?

为什么抽象类代替了接口？

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The reason why Abstract Library Science has aroused suspicion lies in its unsound foundation of inner source construction, and in its lack of philosophical taste and research on concrete evidence.

“抽象图书馆学”招致置疑的主要原因是其内在资源建设的根基不牢，缺少哲学品位，缺乏实证研究。

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This discovery explains why Kalinese miniature statues were abstract and entirely different in style: molds could be used only for life-size sculptures.

这一发现解释了为什么卡利尼斯微型雕塑是抽象的，而且风格完全不同：模具只能用于真人大小的雕塑。

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The last line of that abstract also highlights why it is that free (or even freeish) market systems so outperform the non-market ones.

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Bonnard never painted from life, only from memory, which explains why his painting feels at once concrete and abstract.

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People focused on "why" tend to frame the world in more abstract ways.

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