气体单位时间内动量矩的改变等于作用在流体上的外力矩的翻译：Gas per unit of time of moment of momentum of change is equal to the action of external forces on the fluid moments 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

Gas per unit time is equal to the role of angular momentum change in the external torque on the fluid

Gas per unit of time of moment of momentum of change is equal to the action of external forces on the fluid moments

In the gas unit time the moment of momentum change is equal to the function on the fluid outside moment of force

gas unit time torque momentum is equal to the change in fluid role outside of torque

Gas per unit of time of moment of momentum of change is equal to the action of external forces on the fluid moments