As a practical man, Wang Jian relied on basic mechanical principles to overcome difficulties with the design, but for further improvements he has had to turn to system theory analysis, which is where Yen Hung-sen's scientific expertise comes into play.
長於實務的王湔，以基本的機械原理自己摸索，解決了很多難題，但要再改良，就需要以系統理論來分析。