It is always the basic material which constitutes the object and which, in the natural course of things, is worn down and becomes "older".
构成客体的总是基本物质，而在事物的自然过程中，这些基本物质被磨损，变得“陈旧”。
The theory based on basic material science is summarized.
简单概述了基本材料科学的理论。
This first section covers some basic material on XML syntax.
第一节介绍xml语法的一些基本知识。
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