中音部的
Alto
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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)。
They are referred to as "alto" clouds and bear such names as altostratus, which are flat, or altocumulus (pictured), which are puffy.
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