conservationaladj.保存的；守恒的；；油封的conservationn.保存；保护；守恒；节约conservation felt polishing wheel防腐蚀毡抛光轮conservation of absolute vorticity绝对涡度守恒conservation of atmospheric energy大气能量守恒conservation-oriented management节约型管理conservation of historic buildings古建筑保护Conservation-oriented government节约型政府conservation water resource forest水源涵养林conservation of moment of momentum动量矩守恒Conservation of historical district历史街区保护conservation and non-conservation守恒与不守恒