triad

the triad of medication, diet, and exercise are necessary in diabetes care.

药物治疗、规和身体锻炼是糖病治疗中必不可步骤。

At tetrad stage, dyad, triad, tetrad with micronucleus and polyad appeared.

四分体时期还出现二分体、分体、含微核异常四分体及多分体。

Dyskeratosis congenita (DKC) is a rare inherited disease characterized by the triad of abnormal skin pigmentation, nail dystrophy, and mucosal leukoplakia.

先天性角化不良症（DKC）为一见之遗传性疾病，项主要特徵为皮肤色素异常、 指甲生长异常及黏膜白斑症。

This is a hierarchy of unequal diads and triads, extended by analogy to larger scales, from father-son to emperor-subject, and a lot in between.

这是一个不平衡二人或人阶序，依此类推到更大范围，从父亲和儿子到国王和随从，不一而足。