System identification is the art and science of building mathematical models of dynamic systems from observed input-output data.
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。
晏子春秋
The stream of thought flows toward purposeful ends.
劳动的自然价格是使劳动者能够生存并延续其后代所必需的价格，既不增加也不减少。
最有力的艺术往往源于最简单的想法。
The uniform， constant， and uninterrupted effort of every man to better his condition， the principle from which public and national as well as private opulence is originally derived.