单词altostratus
n.: 【气】高层云
网络: 高积云；高云；高词云
【气象学】高层云
复数：altostrati
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）。
Analysis on Precipitation Altostratus Microphysical Structure in Spring over North-East Qinghai
青海东北部春季系统性降水高层云系微物理结构分析