在世界历史上，丝绸之路是最重要的文明渠道之一。
The Silk Road was one of the most significant channels of civilizations in world history.
仿真结果表明，较常规PID，步进式PID控制渠道输水，水位波动小，超调量小，较适合明渠输水控制的实际运行情况。
The simulations show that the water fluctuation and overshoot are smaller using Step-PID than using general PID control method. The method is suitable to open channel flow.
人工渠道中的水流绝大多数是非均匀流，分析计算其水面曲线的变化规律是确定明渠边墙高度及回水淹没范围的重要依据，因此在工程实践中具有十分重要的意义。
Most of wter flow in open-channel or in river belongs to steady non-uniform flow. The surface profiles are caused by changes of channel section. It is very important to analyze its computations.
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