The smallest diameter present in a wellbore through which a tool string must pass to enable access to the operating depth or zone of interest.

工具管柱要到达工作深度或有关层段所必须经过的在井筒中存在的最小直径。

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The above article goes into a lot of depth about choosing how to test your operating system and how to integrate that with your development process.

上面列出的文章，深入讨论了，如何选择和测试你的操作系统，如何有机的将你的开发进程融合到操作系统中。

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The breaker and operating mechanism use up-under arrangement structure, reducing the depth of the breaker effectively.

断路器与操动机构采用上下布置结构，有效地降低了断路器的深度。

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