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协变和逆变，是为解决问题而生的。而要理清解决什么样的问题，需要首先从理清几个简单的概念开始。首先我们进行一点操作：

In Windows, you work with zipped files and folders in the same way that you're employed with uncompressed data files and folders. Blend many information into just one zipped folder to much more effortlessly share a bunch of information.

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你的隐私选择 主题 亮 暗 高对比度

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The web site looks Secure casper77 to utilize. Even so because the Evaluation of the website is done instantly, we constantly advocate you need to do your individual examining likewise to verify the web site is Safe and sound to implement. Beneficial highlights We uncovered a sound SSL certification

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而这种原始转换（由子类转换为父类）方向相同的可变性，被称为协变（covariant）；其反向操作则被称为逆变（contravariant）。当同样的情形应用于泛型时，例如：

In the Privateness portion, crystal clear the Test bins and select Use. Now Rapid access will only display your casper77 pinned folders. (If you turn them again on, files you Beforehand faraway from Rapid access might clearly casper77 show up all over again.)