They concentrated on better definition of the optical image.
他们致力于提高该光学影像的清晰度。
They concentrated on better definition of the optical image.
他们致力于提高该光学影像的鲜明度。
Optical image: image formed digitally on a video screen.
光学影像：在荧幕上以数码形式构成的影像。
Optical image: image formed digitally on a video screen.
光学影像：在荧幕上以数码形式构成的影像。
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