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。
Our frustration is greater when we have much and want more than when we have nothing and want some. We are less dissatisfied when we lack many things than when we seem to lack but one thing.
【释义】一尺长的木头必定会有节疤，一寸大的美玉也难免会有瑕疵。
Success in life means doing that which is the very best for us, under the conditions in which we are placed.
诗歌是心灵的语言。
The mind is a dynamic system that constantly adapts to its environment.