The results provide a useful theory basis and technology reference.

结果为水液压泵的研究提供了理论依据和技术参考。

youdao

A useful theory, in addition to explaining past observations, helps to predict events that have not as yet been observed.

一个有用的理论，除了能够解释过去的观测，还有助于预测那些未被观测到的事件。

youdao

The application of this new theory can simplify the complicated traffic system and provide a useful theory for system controlling. Meanwhile discusses the feasibility of its application.

应用这种新的理论可以使干涉和输入过于复杂的交通系统用几何控制方法得以简化，为系统控制提供实用的理论，并讨论了其应用的可行性。

youdao

Retail pricing is very much part of game theory and seeing this in the raw, rather than in simulated experiments, could be a very useful data set to mine to work out more about how such game theory applies in the real world.

FORBES: Shopobot: a New Toy for Economists

The God particle is an integral solution to explaining a theory of everything, and thus serves a useful purpose.

FORBES: Wall Street Discovers The God Particle

If you prefer the second theory, then you might consider grades a useful instrument of positive or negative reinforcement, but the only thing that matters is what students actually learn.

NEWYORKER: Live and Learn