Maybe you can see the Great Wall clearly from space with binoculars but not with the naked eye.

也许你可以用双筒望远镜从太空中清楚地看到长城，但用肉眼却看不见。

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The distance the wall could be seen depends on the angular resolution of the imaging system (the eye) and the contrast of the wall vs. background.

能看清长城的最远距离取决于成像系统(眼睛)的角度分辨率以及长城与它周围环境的对比度。

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The drug has to be delivered to the retina, a thin film lining the inner wall of the eye.

药物必须被传递到视网膜这个衬于内眼球的薄膜。

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You'll need to pay attention to his choice of restaurant, his manners and how much eye contact he makes--especially if there's a television set on the wall with a game on.

FORBES: Magazine Article

Dr. Friedman surveyed the room, clearly attempting to make eye contact with the closest suspect, though unfortunately that suspect was Janey Filch, wall-eyed and so shy she looked ready to faint.

NEWYORKER: Playdate

Kodak (nyse: EK - news - people ) Chief Executive Daniel Carp told The Wall Street Journal to keep on an eye on his new hire.

FORBES: Magazine Article