It is imperative, therefore, that we economize with our limited resources and that we apply them where we feel that we will do the most good.

所以我们必须节约有限的资源，用在我们觉得能发挥最大效用的地方。

youdao

By advancing knowledge, we not only create new forms of resources, but we also find ways to economize their use.

通过提高知识，我们不仅创造了新的资源形式，而且还找到了节约使用资源的方法。

youdao

We must economize on fuel.

我们必须节约燃料。

《新英汉大辞典》

We cannot satisfy all of our ends with our limited quantity of goods, so we must economize.

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It just means we have to economize.

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