An aperture mask assembly includes a rotatable frame and a mask having apertures.

一种孔眼掩模组件包括可旋转机架和具有孔眼的掩模。

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Actually, the mask and openings are not really necessary; the mirror alone could serve as aperture.

其实，挡光板及其上的开孔都是不必要的；单单反射镜本身就可以起小孔的作用。

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The mask has mirror effect; designed with aperture bars.

罩囊镜面效果，栅栏结构设计。

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The imaging system developed by graduate student John Hunt and colleagues at Duke University in North Carolina has no lens and instead combines a metamaterial mask or aperture and complicated mathematics to generate an image of a scene.

BBC: Lens-less camera emerges from metamaterials work