- principle of mass conservation
- 质量守恒: conservation of mass
- 原理: principle; tenet; axiom; the ...
- 动量守恒原理: principle of conservation of momentum; principle of momentum conservation
- 能量守恒原理: conservation of energy principle; conservation-of-energy principle; energy conservation principle; principle of conservation of energy
- 能量守恒原则: energy conservation principle
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