principle of conservation of energy [物] 能量守恒原理 ; 能量守恒律 ; 能量守恒定律 ; 能量不灭原理

principle of mass conservation [物] 质量守恒原理

energy conservation principle 能量守恒定律 ; 能量守恒原理

conservation principle 守恒原理

principle of momentum conservation 动量守恒原理

principle of conservation of area 面积守恒原理

principle of conservation of momentum 动量守恒原理

neutron conservation principle 中子守恒原理

principle of conservation 守恒原理

Principle of data conservation 数据守恒原理