That comet is invisible to the unaided eye.

那颗彗星只用肉眼是看不到的。

Some stars are quite visible to the unaided eye.

有些星星肉眼都看得很清晰。

This fungus can just be detected by the unaided eye.

这种真菌只用肉眼就能检查出。

Inclusions in I1 diamonds often are seen to the unaided eye.

I1等级的钻石常含有肉眼可见的内含物。

Barnard's Loop is too faint to be identified with the unaided eye.

巴纳德环太昏暗以致肉眼无法辨认。