There we want to think a tiny bit about spherical coordinates again.

我们需要再次考虑球坐标。

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So, in fact, it simplifies quite a bit if you do it in spherical coordinates.

事实上用球坐标，简化了式子。

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But now the use of the spherical one-cone bit shows that the teeth are abrade heavily in advance, which affects the velocity and life of the bit.

但是目前油田上使用的球形单牙轮钻头由于牙齿先期磨损严重，影响了钻头的机械钻速和寿命。

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