When I discovered this concept, after much difficulty and trail and error, I realized for the first time how huge it was. And how much people like you and me need to know about it.
经历很多艰辛尝试和错误，当我终于发现这个概念时，我第一次意识到它有多广泛，有多少像你我这样的人需要了解它。
Analogy method based on experience is insufficient for complex shape part and Trail-and-error. Only simple finite element increment simulation method is time consuming.
传统的经验类比设计对于复杂拉深件难以奏效，单纯应用有限元增量模拟法进行“试错”耗时多、效率低。
In many cases, the design of control system is based on some theory rather than intuition or trail-and -error.
在许多情形，控制系统的设计是基于一些理论，而不是直觉或者试凑法。
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