conservation

英 [kɒnsə'veɪʃ(ə)n] 美[,kɑnsɚ'veʃən]

• n. 保存，保持；保护

1. an occurrence of improvement by virtue of preventing loss or injury or other change

2. the preservation and careful management of the environment and of natural resources

3. (physics) the maintenance of a certain quantities unchanged during chemical reactions or physical transformations