英 [ˌkɒnsəˈveɪʃ(ə)n] 美 [ˌkɑːnsərˈveɪʃ(ə)n]
n. 保护，保存；节约，防止浪费；守恒定律[1]
柯林斯英汉双解大词典
conservation /ˌkɒnsəˈveɪʃən/ CET4 TEM4
1.N-UNCOUNT Conservation is saving and protecting the environment. (对环境的) 保护
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
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[1]
energy conservation 能量守恒；能源节约
water conservation 节约用水，水源保护；水利
soil conservation 土壤保持
water and soil conservation 水土保持
resource conservation 资源保护；资源保育
conservation of energy [物]能量守恒（定律）
conservation law 守恒律
environmental conservation 环境保护
mass conservation 质量守恒；质量不变