Nested types are often used to describe objects that are used only by the types that contain them.
通常用于描述仅由包含它们的类型所使用的对象。
The Resource Description Framework (RDF) is a perfect way to describe objects while maintaining the meaning of that data.
资源描述框架(Resource Description Framework, RDF)是描述对象同时保留数据含义的理想方法。
He was struggling to find the right equations that would describe his new concept of gravity, ones that would define how objects move through space and how space is curved by objects.
他一直在努力寻找合适的方程来描述他的新引力概念，这些方程将定义物体如何在空间中移动，以及物体是如何扭曲空间的。
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