triad [ˈtraɪˌæd, -əd]

例句:

• Unless you're an eight-foot-tall Chinese Triad boss with pincers for hands.
  来自THETIMES
• For the faculty, there exists the triad of responsibilities: teaching, research, and service.
  教员要承担三重责任：教学、研究与服务。
  
• This coordinate system is called the triad at the point.
  这个坐标系叫做该点的三面形坐标系.
  
• Diagnosis is based on a clinical triad.
  本病诊断取决于临床上的三征.
  
• The therapeutic triad can be combined in any number of ways.
  来自NEWYORKER
• A chord...containing a major third and an augmented fifth...is called an augmented triad.
  来自E. Prout