动物的心脏是其生命的基础，是体内一切的主宰。

失败只是通往成功的垫脚石。

The database is the most important piece of software in the enterprise, and the most important piece of software in the enterprise is the database. The database is the foundation of all applications. The database is the heart of the application, and the application is the heart of the business.

系统辨识是从观测到的输入输出数据中建立动态系统数学模型的科学与艺术。