她不仅仅是我的妈妈，她还是她自己。

In looking for someone to hire, you look for three qualities: integrity, intelligence, and energy. But the most important is integrity because if they don't have that, the other two qualities, intelligence and energy, are going to kill you.

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。