用物镜光阑阻挡衍射束，只让透射束通过，在像平面成的像称 明场像（bright field image）。若移动物镜光栅，使透射束被遮住，衍射束通过所 得到的像称暗场像（dark field image）。
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Multiple dark field image can readily be used in revealing the relation between diffraction pattern and bright-and dark-field images.
多重暗场象可以快速揭示衍射花样同明场和暗场象之间的关系。
Owing to the combination of bright-field and dark-field receiving image modes, most surface defects of interest are ensured to be effectively detected.
明、暗域相结合的成像模式确保了大部分缺陷的有效检出。
I'd seen a highly magnified image on one of Fields's computer screens, and it looked like a deep-sea photograph: bright colors against a field of black.
我已经看到一个非常奇妙的图象好象在电脑的显示屏中。它好象一副深海的：照片黑底色上映衬着明亮的颜色。
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