灵活的套有一个中空的内部形成一个内部流体室。
The flexible sleeve has a hollow interior which forms an internal fluid chamber.
计算管线内部流体荷载，也就是管系的压力分布计算。
The fluid load in pipeline is calculated, that is calculating the pressure distribution of pipeline.
环隙切剖面上形成的涡，其内部流体都要与涡外部的流体进行质量交换。
The vortices that are formed on the tangential section, there existed mass transfer between inner and outer parts of fluid.
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