The factories have closed for the weekend to conserve energy.

为了节省能源，这些工厂在周末关闭。

We must abandon our wasteful ways and conserve resources.

我们必须摒弃我们浪费的作风，开始节约资源。

a big increase in US aid to help developing countries conserve their forests.

美国对帮助发展中国家保护森林的援助的大幅增加。

the body responsible for conserving historic buildings.

负责保护历史建筑的组织。