We write it subject to conservation of mass.
要服从质量守恒定律。
This is the story of wildlife conservation in the age of mass extinction.
这是个关于在大规模的物种灭绝时代保护野生动物的故事。
The relation of scale conversion is gotten by use of the mass conservation equation.
同时，引入质量守恒方程，得出弹体的比例尺度换算关系。
The relation of scale conversion is gotten by use of the mass conservation equation.
同时，引入质量守恒方程，得出弹体的比例尺度换算关系。
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