在这种情形中，有两种几乎不能互变的变态。
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.
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.
通过正交偏光显微镜观察研究，发现所得到的化合物是呈现高度稳定的近晶A相和向列相的新型互变液晶。
Study by polarizing microscopy showed that they were enantiotropic liquid crystals with highly stable smectic a and nematic phases.
酮及烯醇互变是互变作用最普通的现象，它们都是真实的化学实体。
Keto-enol tautomerism is the most common tautomery phenomenon. Keto -enol themselves are the real chemical substance.
酮及烯醇互变是互变作用最普通的现象，它们都是真实的化学实体。
Keto-enol tautomerism is the most common tautomery phenomenon. Keto -enol themselves are the real chemical substance.
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