conservationaladj.保存的；守恒的；；油封的conservationn.保存；保护；守恒；节约conservation and development planning保护与发展conservation tillage with straw cover覆盖免耕Conservation under normal temperature常温保存conservation and construction planning保护与建设规划Conservation and steps and restoration保护与修复conservation and renewal of old-city旧城保护与更新Conservation Environment of Collection藏品保存环境Conservation planningof historic cities历史文化名城保护规划Conservation of complex power technique复功率守恒Conservation of the natural environment自然环境的保护