The key to successful identification is to find a model structure that is flexible enough to capture the essential features of the system, yet simple enough to be estimated from the available data.
成功辨识的关键是找到一个足够灵活的模型结构，以捕捉系统的基本特征，同时又足够简单，可以从现有数据中估计出来。
The most important thing in mathematics is to ask the right questions.
The true measure of success is not just financial performance, but how we impact communities and the environment.
To die for one's country is such a worthy fate that all compete for so beautiful a death.