Circular screen: a glass halftone screen having a circular outside frame, to permit screen rotation, for convenient screen Angle selection.
圆网屏：是玻璃制的半色调网屏。它有着可以旋转的圆形外框，方便调换网线角度。
It is shown that this orientation method for crystals with large optical Angle is convenient, best and valid.
这个在大光轴角厚晶体上进行定向的方法是方便、快速和有效的。
A convenient method to choose the direction of rotation Angle of quantum rotation gate is proposed.
针对量子旋转门的旋转角方向的选择，提出了一种简易快捷的新方法。
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