Now select the other shapes (triangle and small shapes in the center) (pic 11) and then extrude them to -0.5 of -z axis (pic 12). remember : to extrude a curve as nurbs, open your extrude option box and set the style to distance, and make sure output geometry has been set to nurbs

现在选择其它曲线 ( 三角形和中心那些小圆 )(pic 11), 然后在 -z 轴上 Extrude -0.5 的距离 .
记住 : Extrude 出来是应该椒 Nurbs 曲面，打开你的 Extrude 选项，设定距离并确定输出的几何体为 Nurbs 曲面 .

Before entering this fillet & trim work, there is something important that we should know about preview resolution (antialias settings) and tessellation smoothness within Maya.

在进入 fillet 及 trim 的工作之前，有一些很重要的事情我们应该了解一下 Maya 的镶嵌的圆滑设置 .

Most of new Maya users are shy of this nurbs gaps that are caused by fillet & trim works.

很多的使用 Maya 的人都会造成此类现象。