后端调整流量，前端流量又会变化。

Adjust the back-end traffic flow will change the front end.

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从而解决了同时调整流量和自由面的困难。

Thus, the discharge and free surface profile can be adjusted simultaneously.

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带宽控制调整流量控制参数，以提供与第二流相关的服务质量参数。

The bandwidth control adjusting the flow control parameter for supporting quality-of-service parameters associated with the second stream.

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