They are switches that enable one electric current to control the passage of another.

它们以开关的方式工作，使得一个通路中的电流可以控制另一通路中的电流。

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IMPORTANT: Unless the server is exceptionally powerful, you should only enable one batch service.

重点：除非服务器特别强大，否则只应该启用一个批服务。

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We had to run it at half-speed owing to network slowness and to enable one particular step to complete consistently.

因为网速问题，我们不得不以半速运行并且保证每一步的一致性。

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