尽管这些接口表面上看起来是如此稀松平常，但是它们却暴露出关于向后兼容性、互操作性、以及协变的作用等相当复杂的故事。

While these interfaces are quite humble on the surface, they expose the rather complex story of backwards compatibility, interoperability, and the role of covariance.

youdao

尽管这些接口表面上看起来是如此稀松平常，但是它们却暴露出关于向后兼容性、互操作性、以及协变的作用等相当复杂的故事。

While these interfaces are quite humble on the surface, they expose the rather complex story of backwards compatibility, interoperability, and the role of covariance.

youdao