为了提高大型对称自由曲面的加工效率，提出了一种新型的对称加工方法，并分析了对称加工的特点。
In order to enhance the machining efficiency of a large symmetrical freeform surface, this paper put forward a new concept of symmetrical machining(SM), analyzed the characteristics of SM.
利用现代的机械加工技术，服装道具总监艾沃·科温尼得以制造出史上第一件完美对称的维德头盔。
Using modern machining techniques, Costume Props Supervisor Ivo Coveney was able to create, for the first time, a perfectly symmetrical Vader helmet.
计算结果指出，当轴棱锥的截面为圆对称的理想加工时，轴棱锥产生的光场分布为近似理想的零阶贝塞耳光。
Results show that if the cross-section of the axicon is ideally manufactured in circular symmetry, the field distribution behind the axicon is approximately an ideal Bessel beam.
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