高挂在天空的一层卷云。
The most beautiful cloud is cirrus.
最美丽的云就是卷云。
They are the first cirrus clouds seen on an outer planet.
它们是首次在外行星上发现的卷云。
Hexagonal ice crystal are the basic form of the particles in cirrus.
六角柱冰晶是卷云中粒子的基本形态。
Hexagonal ice crystal are the basic form of the particles in cirrus.
六角柱冰晶是卷云中粒子的基本形态。
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