Drilling with complex pressure system is a worldwide difficult problem. Several different pressure gradient stratums exist in the same bare hole section, which is very common in the drilling process.

复杂压力系统钻井是当今钻井技术领域的世界性难题，钻井过程中常常碰到多个不同压力梯度的地层处于同一裸眼井段中。

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Mortimer's Hole is laid bare in a recent digital reconstruction of the passage through Nottingham's Castle Rock.

人们最近通过数码重建技术展示出莫蒂默洞穴的通道线路，这条通道穿过诺丁汉石头城堡。

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A battery pack including: a bare cell, a case to house the bare cell, having at least one hole formed therein;

一种电池组，包括：裸电池；容纳所述裸电池的壳体，其形成有至少一 个孔；

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Not a nasty, dirty, wet hole, filled with the ends of worms and an oozy smell, nor yet a dry, bare, sandy hole with nothing in it to sit down on or to eat: it was a hobbit-hole, and that means comfort.

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The depth of the hole into which the U.K. has now sunk was laid bare in last week's Autumn Statement by Chancellor of the Exchequer George Osborne.

WSJ: U.K. Is New Recruit on Europe's Sick List