conservation

1. N-UNCOUNT Conservation is saving and protecting the environment. (对环境的) 保护

...a four-nation regional meeting on elephant conservation. …一次有关大象保护的4国区域性会议。

2. N-UNCOUNT Conservation is saving and protecting historical objects or works of art such as paintings, sculptures, or buildings. (对历史文物、艺术品等的) 保护

Then he began his most famous work, the conservation and rebinding of the Book of Kells. 接着，他就开始了他最著名的工作，即对《凯尔经》的维护和重新装订。

3. N-UNCOUNT The conservation of a supply of something is the careful use of it so that it lasts for a long time. 节约

...projects aimed at promoting energy conservation. …旨在促进能源节约的项目。