Drill a starter hole in each corner.
钻一个洞，在精简的每个角落。
Thee grass from the earth drill out, tender and green, it covered every corner of the campus, it can be seen everywhere the green life, how tough it is!
小草从泥土里钻了出来，嫩嫩的，绿绿的，它爬满了校园的每一个角落，到处可见它那绿色的生命，它是多么地顽强！ ！
Point angles at outer corner and chisel edge corner are proposed to be used as the drill design parameters to determine the type uniquely and the relief Angle is used as a supplement parameter.
针对该钻型的特点，提出用钻尖主刃的外缘和横刃转点处的锋角作为其设计参数值。
Point angles at outer corner and chisel edge corner are proposed to be used as the drill design parameters to determine the type uniquely and the relief Angle is used as a supplement parameter.
针对该钻型的特点，提出用钻尖主刃的外缘和横刃转点处的锋角作为其设计参数值。
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