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历史：
triad★☆☆☆☆
The spelling Triad is also used for meaning 1. 拼写 Triad 亦用于义项 1。
1[N-COUNT 可数名词] 三合会(旧中国秘密组织)；The Triads were Chinese secret societies in old China. [usu pl]

  • …gangs, known as the Triads.

    称作“三合会”的帮派

2[N-COUNT 可数名词] 三个一组;三件一套;三位一体；A triad is a group of three similar things. [oft N of n] [Formal]

  • 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。

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