... 预张力锚杆：pretensioned bolt 预先钻进：pilot boring 预先注水：preliminary infusion ...
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... pilot bearing 导轴承，导向架 pilot boring 先行试钻 pilot burner 辅助燃烧器，辅助烧嘴 ...
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pilot boring bar 有导径的镗杆
raise-boring machine pilot drifting method 反井钻机导硐施工法
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The only major difference is that boring jigs are normally fitted with a pilot bushing or bearing to support the outer end of the boring bar during the machining operation.
唯一最重要的差别是镗夹具一般用于控制衬套，或者在机器操作时支撑镗杆的外端。
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