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- Birkhoff系统Birkhoffian system
- 自由Birkhoff系统freedom Birkhoffian system
- 系统system
- 相对论性自治Birkhoff系统的第一积分与其变分方程特解的联系Connexion of First Integrals with Particular Solution of theVariational Equations for Relativistic Autonomous Birkhoff Systems
- 系统的systemic
- 信息系统information system
- 系统信息system information
- 系统管理员system administrator
- Birkhoff正交Biekhoff arthogonalizes
- 文件系统file systems
- Birkhoff理论Birkhoff theory
- Birkhoff正交性Birkhoff orthogonality
- 系统文件system file
- 二元Birkhoff插值bivariate Birkhoff interpolation
- 系统地by the numbers
- 生态系统ecological system
- 系统盘system disk
- 免疫系统immunologic system
- 管理系统managerial system
- 电力系统electric power system
