adv. with the naked eye
用肉眼看上去它们像星星。
我们用肉眼看到的彩虹色的光属于可见光。
The light that we see with our human eyes as a band of rainbow color falls in the range of what's called visible light.
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。
Maybe you can see the Great Wall clearly from space with binoculars but not with the naked eye.
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