例句：
People should insulate their homes to conserve energy.
人们应该使住房隔冷以保存能量。
We should conserve oil and gas by making full use of other energy sources.
我们应该通过充分利用其他能源节约石油和天然气。
Whales carefully conserve their oxygen when underwater in a couple of ways.
鲸鱼在水下以几种方式小心地保存它们的氧气。