Some times maybe one could learn something by experiencing, but one should not have to do so, since there is other better ways to choose. For example, if someone wants to know how a skyscraper is built, he would not to be a worker and build the big building himself. What one should do is just observation. If he likes to learn more, he should learn some fundamental knowledge such as architecture and physics. Or a manager of a supermarket needs to know how his rival supermarkets operate, he have not to be the employee or manager of his rival company. The better way is making some investigation first, and then making proper analogy and comprehensive analysis. However, in some cases, there is no feasibility to practice or no possibility to experience some certain theory or event. For example, the special theory of relativity tells us that when an objects velocity is close to that of light, time would be much slower or even stop with respect to the object. It is true that one would have much deeper understanding concerning the principle if he or she experiences this great theory; but can anybody have the confidence to manage to achieve that fantastic speed now or in 50 years later in future? For most common ones, some theories can only be learned by other ways. Another example: in almost all cases, what a detective desperately wants to know is what the real situation of the scene of the crime is when the criminal committed his offence. But it is clearly impossible to experience the crime again. However, the detective has to rely on deducing, analyzing, or even imagination.
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