He accomplished this by giving the stage a greater feeling of depth, which he did by cutting up some of the rigid background scenery and placing it at various angles and distances from the audience.
他通过给舞台一种更有深度的感觉来做到这一点，他裁剪了一些死板的背景风景，并把它放在距离观众不同的角度和距离。
Placing a diffractive optical element(DOE) on the incident laser beam to improve the depth of focus, the DOE'S aperture is variable.
在入射光束的孔径受限制的情况下，利用衍射光学元件来增加激光束的焦深。
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