虽然从具体的实现来看，前几篇文章很有用(希望如此)，但我的目标是让这些文章真正实用。
While my last several articles have been useful (I hope) from the perspective of a specific implementation, my goal is to make this article down-to-earth and practical.
相比较而言，实用性的应用会在人们的智能手机上停留得更久，因为它们确实很有用。
In contrast, utility apps will hang around on people's smartphones longer, provided they're actually useful.
wget实用程序很有用，但在标准的系统分发版中很难找到它。
The wget utility is useful but isn't commonly found standard in distributions.
Hello实用工具内容并不多，但是对于研究JAR文件却是一个很有用的“脚手架”，我们先从执行此代码开始。
The Hello utility isn't much, but it's a useful scaffold for exploring JAR files, starting with executing the code.
Hello实用工具内容并不多，但是对于研究JAR文件却是一个很有用的“脚手架”，我们先从执行此代码开始。
The Hello utility isn't much, but it's a useful scaffold for exploring JAR files, starting with executing the code.
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