The first clouds are thin, wispy cirrus, followed by sheets of cirrus and cirrostratus and altostratus.
最开始的云石薄而缥缈的卷云，紧接着是成片的卷层云和高层云。
2
They are referred to as "alto" clouds and bear such names as altostratus, which are flat, or altocumulus (pictured), which are puffy.
它们被称作“阿尔图”(中音部——译注)云，包括平坦的高层云和肥胖的高积云(上图)。
3
Patchy, highly textured cumulus clouds are present at lower altitudes, while grey altostratus clouds are stretched out by prevailing winds at higher altitudes.