You are deciding your life right now.
我认为在生活中你永远不应该安于现状。
Old paint on canvas, as it ages, sometimes becomes transparent. When that happens it is possible, in some pictures, to see the original lines: a tree will show through a woman's dress, a child makes way for a dog, a large boat is no longer on an open sea. That is called pentimento because the painter 'repented,' changed his mind. Perhaps it would be as well to say that the old conception, replaced by a later choice, is a way of seeing and then seeing again.
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。