为了把不明确的概念减少到最少――并和多数现代的其它模型语言形成对比―― 第一个标准化的UML定义是用元模型来指定的。

To minimize ambiguity -- and in contrast to most other modeling languages of the time -- the first standardized definition of UML was specified using a metamodel.

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虽然形状主要是通过元素间的对比来定义，但它们也可以借助轮廓线或边来定义。

While shapes are mostly defined by a contrast between elements, they're also defined by their contour, or edge.

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更有用的是，你可以选择世界银行定义的区域，进而察看几组国家的变化或者和其他区域作对比。

More usefully, you can select regions, as defined by the World Bank, and see how groups of countries have changed or compare with other regions.

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So compare the definition of words with what's written here in the nerdy notation on the board.

不妨去对比一下这个定义的,文字表述与黑板上的符号表述

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Often what you'll see is not a table based on this definition, but something that's called the Pauling definition of electronegativity, but it's exactly the same idea and the same trend as this more numerical way to think about what the meaning of electronegativity is.

通常你看到的表格一般都不是基于这种定义的，而是基于,鲍林定义的电负性，但在意义上是相同的，并且满足同样的周期性规律,当和这种这种更数值化地理解电负性的定义,作对比时。

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