你永远不会太老去设定另一个目标或梦想一个新的梦想。
You are never too old to set another goal or to dream a new dream.
The only way to have a good day is to start it with a positive attitude.
真相很少是纯粹的,也从来不是简单的。
The balance between production and conservation is delicate, but achievable.
系统辨识的挑战不仅在于拟合数据,还在于提取有意义且可推广的模型。