对构造上表里一同，形状混沌的石头，先锯截出粗概括，再详尽的雕凿，毕竟刻划纹路。
Exterior-interior together on the structure, shape, the stone of chaos, saw cut the coarse summarized first, then elaborate carving, score lines, after all.
随着截平面位置的改变，可以在锥面上截出形状不同的椭圆。
We can obtain ellipses of different shapes by intersecting a cone with a plane in different relative positions.
所述反射器的出光口的周向设有截光板。
An intercepting panel is arranged on the circumference of the light outlet of the reflector.
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