triadic

例句：

1. 1. The triadic structure of the new project is very complex.
   新项目的三重结构非常复杂。
2. 2.The triadic relationship between the two countries has been strained for years.
   两国之间的三重关系多年来一直紧张。
3. 3. The triadic system of education is widely used in many countries.
   教育中的三元系统在许多国家广泛使用。