[TOP]cumulus cu·mu·lus / ˈkju:mjələs / noun əu] (technical 术语) a type of thick white cloud 积云[TOP]cumulus cu·mu·lus / ˈkjumjələs ; ˈkju:mjʊləs / noun [C,U] 1. a thick white cloud with a flat bottom edge 积云 [TOP]cumulus['kju:.mjʊ.ləs] noun uncountable specialized » a type of tall white cloud with a wide flat base and rounded shape 积云 Compare cirrus ; nimbus ; stratus [TOP]cumulus
1.N-VAR 可变名词 积云Cumulus is a type of thick white cloud formed when hot air rises very quickly.