A second, more practical issue regarding the potential widespread adoption of AOP is the development of tools and techniques for testing, especially unit testing.

第二，关于对AOP潜在的普遍采用的更实际的问题是测试工具以及技术的开发，特别是单元测试。

youdao

It is clear, then, that while the JAR is a very practical unit of reuse, it lacks the capacity to distinguish between externals and internals and has no means to isolate the latter.

那么，现在有一点很清楚：尽管JAR是一个非常实用的重用单元，但它缺乏区分内部包和外部包的能力，因此没有办法隔离外部包。

youdao

As the unit of deployment (and as the artifact that exists in the file system), the JAR is a very practical unit of reuse but it lacks some of the other characteristics of a good module.

作为一个部署单元(和文件系统中存在的工件)，JAR是一个非常实用的重用单元，但它缺乏作为一个好模块的其他一些特征。

youdao

On a more practical level, the unit is compact, USB-powered, and has a built-in audio-interface (no extra sound card required for headphone monitoring).

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Often a PhD was required just to operate a RS unit and this still took a great amount of time and experience, not at all practical for medical applications.

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