a cumulus cloud at an intermediate altitude of 2 or 3 miles 同义词：altocumulus cloud,
例句与用法
1.
Especially in autumn and winter when the air is not so unstable , cumulus clouds may merge and cover a large part of the sky . they become altocumulus 此外，尤其是秋天和冬天时，天气没那么不稳定，积云会聚合在一起，一大片的覆盖部份的天空，出现了高积云。
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