钻头通常属于刮刀型，装备有PDC或者天然金刚石切削齿，但取芯钻头的特别之处在于钻头中心有一孔。
The bit is usually a drag bit fitted with either PDC or natural diamond cutting structures, but the core bit is unusual in that it has a hole in its center.
采用锯机连同带锯条一起以带锯条工作边锯齿齿尖连线为中心作回转摆动的方法，实现带锯条始终沿着锯切曲线的切线方向进行锯切。
By the method of sawing and saw blade swing taking the line of saw-teeth of saw blade's working side for centre, saw blade always works toward the tangent of sawing curve.
光栅的每一个齿面都垂直于齿面中心和输入波导端点的连线。
Each facet of the grating is perpendicular to the center of facet and the connection lines for input waveguide end points.
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