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adj.白垩的,白垩纪的;n.白垩纪,白垩系; 英英释义: cretaceous[ kri'teiʃəs ]n.from 135 million to 63 million years ago; end of the age of reptiles; appearance of modern insects and flowering plants同义词:Cretaceous periodadj.abounding in chalkof or relating to or denoting the thi