尽管如此，它仍然是非常有用的，特别是对于一些快速的任务，比如将音频文件录制为另一种格式或者仅使用管道进行试验。

Nonetheless, it's still incredibly useful — particularly for quick jobs, such as recoding an audio file to another format or simply experimenting with pipelines.

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模型是用管道粘胶、口香糖、纸夹和油漆等制成的试验品，用于测试那些目前还不想实现的概念。

A mock-up, then, is something you pungle together out of duct tape, chewing gum, paper clips, cardboard, and paint just to test a concept that you don't necessarily want to implement.

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安装，测试，维护和修复水井泵，管道系统和设备，并进行抽水试验，评估水井性能。

Install, test, maintain and repair water well pumps, piping systems and equipment and perform pumping tests to assess well performance.

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