Mystic quartz cut into Concave cut is very beautiful.
神秘石英切割成凹切的是，漂亮极了。
The diameter of a sphere is four times the focal length of a concave mirror cut from it.
凹面镜如果是从圆球上切下来的，圆球的直径会是凹面镜焦距的四倍。
Have a cut, mold, polishing, concave, deep carving and sandblasting the surface of a complete production line of laser engraving.
拥有切、模、抛光、打凹、表面喷砂深雕及激光内雕的完整生产流水线。
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