In other words, their common goal is to help show you just "how deep the rabbit-hole goes."

换言之，他们的共同目标就是帮助你看到兔子洞到底有多深。

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The article describes how DF concept is used in the design of pressure feeders in small-diameter deep-hole drilling process.

介绍如何应用DF 系统原理设计小直径深孔加工中吸压送水器的问题。

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So, how deep in the hole is the US state and local government? The truth is, nobody knows. The states report their liabilities in strange ways, often ignoring accounting conventions.

事实是，没有人知道，且美国在报告他们的债务时，以奇怪的方式呈现，他们忽略会计惯例。

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But what your question does I think remind people is how deep the hole is, how deep the hole was, that we found ourselves in because of this recession.

WHITEHOUSE: Press Briefing

It will undoubtedly revive (someday), but this chart by Calculated Risk provides a good visual to how deep of a hole the US job deficit really is.

FORBES: Ugly Job Chart Just Got Uglier; Investors Doubt Washington