We must adhere to the principle of making study serve the practical purpose.

我们必须坚持学以致用的原则.

《现代汉英综合大词典》

Remembering that the practical purpose of income is to serve as a guide for prudent conduct.

记住收入的实际目的是用来作为审慎行为的指导.

辞典例句

The method of predicting solubility of naphthalene in crude oil can be used for practical purpose.

该估算萘在石油馏分中溶解度的方法可用于指导生产.

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