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altocumulus n.【氣象學】高積云〔略 Ac〕。

altogether

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,尤其是秋天和冬天時,天氣沒那么不穩定,積云會聚合在一起,一大片的覆蓋部份的天空,出現了高積云。