By further examining the exception package and noting the ratio of abstract to concrete classes, you can derive another metric: abstractness.

通过进一步检查exception包并注意抽象到具体类的比率，可以派生出另一个度量：抽象性。

youdao

ScriptEngineManager is probably the only concrete class in the scripting package you'll use regularly; most of the rest are interfaces.

ScriptEngineManager可能是脚本包中惟一一个经常使用的具体类；其他大多数都是接口。

youdao

In Figure 4, the com.acme.ascp.dao package is completely concrete; hence its abstractness is 0.

在图4中，com . acme . ascp . dao包完全是具体的；因此它的抽象性为0。

youdao

The unwary package tourist could find himself in a barely-built concrete rectangle plonked in desert-scrub wasteland, thick with cement dust.

ECONOMIST: For a tourist, Egypt can be either

He is open to serious, realistic, concrete proposals about how we can get from here to there when we talk about building a balanced package that achieves the kind of deficit reduction target that he set, and that the Simpson-Bowles commission set, and that others have set.

WHITEHOUSE: Press Briefing by Press Secretary Jay Carney,