在这种情形中，有两种几乎不能互变的变态。

There are two almost non-interconvertible modifications .

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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.

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寒武系底部硅质岩向粘土岩过渡地带 ，或两者的互层以及蚀变粘土岩是多种元素富集成矿的有利岩层。

Transitional tervain from siliceous rock to clayrock, both interbed and altered clayrock are favourable strata of all kinds of elements concentrated mineralization underneath the Cambrian.

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