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guide hole , feed holes
This avoids any gradual lateral enlargement of the pilot hole.
上述技巧可以避免导航孔逐渐向外侧扩大。
youdao
The valve face is provided with a pilot hole or a micro fixing valve.
阀面上 冲有导向孔或微型固阀。
First thing you want to do is drill a pilot hole in the right location.
第一件事，你想要做的就是钻一个先导孔在正确的位置。
After the word leaked, "we started to celebrate somewhat, " enjoying good times at a local test pilot watering hole.
CNN: Where planes go to die
The drill would use that hole as a pilot and widen the diameter to about 28 inches, which officials have said is wide enough for the miners to be hoisted through.
CNN: Drilling to reach Chile miners yet to begin
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