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。
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。
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；
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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