The make utility checks the modification dates of files—header files, source code, data files, and object files—and builds the C source files that are appropriate.

make 实用工具检查文件（头文件、源代码、数据文件和目标文件）的修改日期，并编译合适的 C 源文件。

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The getstats utility sends queries to the data source in order to estimate the statistics.

getstats实用程序发送查询到数据源，以便估计统计信息。

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In fact, you might want to bundle up the code you write to handle data source configuration and connection into a utility class (that's left for you as an exercise).

实际上可以将处理数据源配置和连接的代码打包成一个工具类(留给读者作为练习)。

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The EcoHub app works by pulling overall home energy usage data, provided by an energy data source, such as a utility or smart meter company.

ENGADGET: Chevy Volt EcoHub app tells drivers how little they pay to charge, goads them into staying green (video)