Because of the cantilever processing, especially the small hole, deep hole and hard workpiece processing, the rigidity of the tool system is particularly important.

因为是悬臂加工，特别是小孔、深孔及硬质工件的加工时，工具系统的刚性尤为重要。

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Millisecond delay technology of high step and deep hole is the first application in China, it offers a realistic method for high step exploitation of middle and small scale limestone mine.

高台段深孔孔内微差爆破技术在我国的首次应用，为中小型石灰石矿山高台段开采提供了切实可行的方法。

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The result shows that ultrasonic vibration drilling could improve the working accuracy and efficiency, and could solve the problems exited in the drilling process of small deep hole.

结果显示，该工艺方法能大幅提高小深孔的加工精度和效率，很好地解决了小深孔加工中存在的难题。

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"The moment you start talking about such massive debts people stop being so careful... they realise they're in a deep hole and small amounts of effort won't dig them out again, " he said.

BBC: Average UK student debts 'could hit ?53,000'