Can you take a stainless cane with 3 mm in diameter and drill a hole of 2 mm alongside the cane at the depth of 3 cm?

你能否用一根直径为3 mm的不锈钢棒，在旁边钻出一个直径为2 mm、深度为3 cm的孔？

youdao

In general can be twist drill hole, but you should drill holes, step and then expanded to the required diameter.

用一般的麻花钻即可开孔，但应先钻小孔，然后步扩大到所需直径。

youdao

It is practically the full diameter of the drill and extends the entire length of the flute, its surface being a part of a cylinder.

它实际是钻子的充分的直径并且扩大长度的凹槽，它的表面是圆筒的零件。

youdao

He said the drill diameter would be reduced from 28 inches to 26 inches until the hammer had cleared the hard rock but added that the slightly smaller diameter would not cause problems for the rescue.

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Inside the riser pipe is a space about half a meter in diameter, large enough to hold the spinning drill pipe and bit and to allow the return flow of drilling fluid.

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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.

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