官名皆以云命：春官为青云，夏官为缙云(缙，指赤色的帛)，秋官为白云，冬官为黑云。
O O O O O O O B-Person I-Person O B-Thing I-Thing O B-Person I-Person O B-Thing I-Thing O B-Thing O O O O O B-Thing O O B-Person I-Person O B-Thing I-Thing O B-Person I-Person O B-Thing I-Thing O