Through the testing interface, you can exercise the APIs of the components to learn about their behavior.

通过测试接口，可以使用组件的API，了解它们的行为。

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And a reserved producing fluid level (PFL) testing interface.

同时预留有动液面测试接口。

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They provide a narrow, specialized testing interface.

它们提供一个狭小的、专用的测试界面。

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They provide a narrow, specialized testing interface.

它们提供一个狭小的、专用的测试界面。

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