它声称，圆工具无法产生与黑面作为一个点画，因为它的光线更加困难，以反映一个小腔具有平坦的墙壁。
It's claimed that a round tool cannot produce as dark a stipple as a faceted one, as it's more difficult for light to reflect from a tiny cavity which has flat walls.
这种测量工具用以测量奇数齿齿轮的齿顶圆和齿根圆直径。
The measuring instrument can measure addendum circle and dedendum circle diameter of odd-tooth gears.
这个按钮的形状并不是一个真正的圆，因此你要使用钢笔工具来绘制它。
The shape of the button is not perfectly circular, so you will have to use the Pen Tool to draw it.
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