In a dark place , our pupils dilate . a person will feel discomfort and lost his dark adaptation if a strong light shines on his eyes suddenly . photos of wispy nebulae and galaxies can only be taken with extended exposure 人的瞳孔会在黑暗地方扩张，如果突然以强光照射眼睛，不但令人感到不适，更会使人看不见较暗的星星。
Cirrus is usually thin , wispy and scattered . there are patches of narrow bands with fibrous texture which look like feathers , hair , tenuous trail or ponytails . it is fascinating to see cirrus in a variety of shapes and sizes 卷云云层通常不厚，且细致而分散，呈现一丝丝的具有纤维组织的云彩，像羽毛头发乱丝或马尾，姿态很多，相当有趣。
During a rare observation last weekend , cassini ' s cameras revealed a new ring at saturn and other spectacular sights , including wispy fingers of icy material stretching out tens of thousands of kilometers from enceladus and even an image of distant planet earth 在上周少有的观测中，卡西尼的照相机显示出土星的一个新环和其他一些壮观景象，包括从土卫二伸展出的数万千米细指状冰物质以及回望地球的一张照片。
