triarch

例句：

1. 1. The triarch system is a complex political structure that has been in place for centuries.
   三头统治体系是一种复杂的政治结构，已经存在了几个世纪。
2. 2. In the triarch system, each of the three leaders has equal power and influence.
   在三头统治体系中，三位领导人拥有相等的权力和影响力。
3. 3. The triarch system was established to ensure stability and balance in government.
   三头统治体系被建立是为了确保政府的稳定性和平衡。