opaque mask meaning in Chinese

不透明荫罩

If you were to block out the outermost diffracted orders by placing an opaque mask at the rear of the objective , you could reduce the resolution of the lines of the grating , or any other detailed object , or " destroy " the resolution altogether so that the specimen would not be visible
假如用不透明的遮挡物在物镜后焦面挡住外圈衍射级的光线，线形栅格图像的分辨率将下降，这样完全地破坏了分辨率，标本的细节就无法看见。