This is the 387th most frequent Chinese word.
体系
System; framework.
The word '体系' here is used to describe the structured system of education.
我们的教育体系需要不断地改进。
Our education system needs continuous improvement.
In this sentence, '体系' refers to a structured framework for management.
公司正在建立一个完善的管理体系。
The company is establishing a comprehensive management system.
Here '体系' is used to denote the structured and interdependent ecosystem.