1N-UNCOUNT (对环境的)保护Conservation is saving and protecting the environment. (对环境的)保护
...a four-nation regional meeting on elephant conservation.
四国保护大象的地区性会议
...tree-planting and other conservation projects.
植树以及其他环保计划
2N-UNCOUNT (对文物或艺术品的) 保护Conservation is saving and protecting historical objects or works of art such as paintings, sculptures, or buildings. (对文物或艺术品的) 保护
Then he began his most famous work, the conservation and rebinding of the Book of Kells. [+ of]
之后他就开始了他最为出名的工作,即保护并重新装订《凯尔斯书》。
3N-UNCOUNT 节约;防止浪费 The conservation of a supply of something is the careful use of it so that it lasts for a long time. 节约;防止浪费
...projects aimed at promoting energy conservation.
旨在促进节约能源的计划
...rules concerning the conservation of fishery resources.