law of conservation and conversion of energy

例句：

1. 1. The government is working hard to protect the environment.
   政府正在努力保护环境。
2. 2. We need to conserve water and electricity during the drought.
   在干旱期间，我们需要节约用水和用电。
3. 3. The conservation of natural resources is crucial for sustainable development.
   自然资源的保存对于可持续发展至关重要。