conservation/kɔnsəˈveɪʃ(ə)n/
n.1. 保护；保存There is a need for the conservation of trees, or there will soon be no forests.有必要保护树木，否则不久将会没有森林了。
2. 节约（自然资源）However, conservation alone is not the answer.然而，仅仅靠节约还不是解决问题的办法。
Conservation of water is of great importance in desert areas.沙漠地区实行控制用水非常重要。