1 the protection of the natural world (对大自然的)保护:
Conservation groups are protesting against the plan to build a road through the forest.保护自然组织反对兴建道路穿越森林的计划。
2 not allowing sth to be wasted, damaged or destroyed 保护;保存;节约:
the conservation of energy节约能源☞verb conserve 动词为conserve