当透镜系统旋转时，光点画出一个圆形轨迹。
The spot of light describes a circular path when the lens assembly is rotated .
该透镜由任意旋转曲面形阵列或介质材料构成。
The lens consists of an array with any curved surface of revolution, or of dielectric material.
几个不同的镜头装在透镜旋转台上，这样可以很快改换镜头。
Several lenses mounted on a turret arrangement permit quick lens changes.
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