If you look at the history of engines there are discrete advances when people were able to apply the theory more and more.

如果你去回顾一下引擎的发展史,就会发现在这进程中的取得的各种突破,都源于对理论更加充分的应用

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At this level of abstraction, plainly there isn't all that much incentive to apply thinking of that kind, but on the other hand undoubtedly theory does exist for the most part to be applied.

就这门课程中理论的抽象程度而言，没必要把它,用于实践，但是在绝大多数情况下,理论无疑都是为了实践而存在。

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