1. We're going to have to economize from now on. 我们得从现在起节省开支。
2. Old people often try to economize on heating, thus endangering their health. 老年人常常想方设法节约用暖气,结果损害了他们的健康。
3. 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。