入髓点的正确选择有助于保持开髓钻的正确方向，通常入髓点处导向孔（pilot hole）的直径应较开髓钻的直径大至少2mm,如果开髓钻与导向孔骨性边缘之间发生碰撞则应扩大导向孔的直径，否则开髓钻在逐渐增粗的过程中...
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阀面上 冲有导向孔或微型固阀。
The valve face is provided with a pilot hole or a micro fixing valve.
接下来，宽带双反射带通和导向孔箱体也有很好的效率。
Next in line, the wide-bandwidth dual-reflex and the ported enclosure exhibit very good efficiency as well.
通常的误解就是导向孔设计要比密闭箱设计产生更多的失真。
There is a common misconception that ported designs produce more distortion than sealed boxes.
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