A curious trait they all share is that they have only one eye: a large, pupil-less disc, red and glowing.
他们所共有的一个有趣的特征就是他们只有一只眼睛:一只巨大的、没有瞳孔的、散发着红光的眼睛。
2
The eye of a nautilus mollusk. The lens-lesspupil works rather like the aperture of a pinhole camera.
鹦鹉螺之眼。这种没有透镜结构的瞳孔更像是针孔相机的孔。
3
A modified segmental quadratic interpolation method which describes the shape of optical system pupil with relative coordinate error less than 1% and area error about 0.25%, is presented.