The distinction between covariance and contravariance is important for computations with tensors, which often have mixed variance.

协变和逆变的区别对于张量的计算尤为重要，这往往会出现混合方差。

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In the meantime, I further elucidated the compatibility, incompatibility and contravariance of the mathematical concept.

同时，还进一步阐明了数学概念的兼容性、非兼容性和反变性。

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Note that although the above examples show how to declare covariance and contravariance for delegate types, it's not different to do so with interfaces.

注意尽管上面的例子只展示了对于代理类型如何声明协变和逆变。对于接口这样做也是不难的。

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