压缩波在减速流中变陡。

A compression wave in decelerating flow steepens.

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结果表明：当环境流中弱二次切变强度增加（减少）时，扰动动能的最大值增加（减小），扰动动能的变化加速（减速）；

The result indicates:when the weakly secondary shear grows(decays), the maximum value of the perturbation kinetic energy also grows(decays), and the change of the energy accelerates(slows).

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输送带煤流采样机是以电机为动力，通过减速器及链轮传递驱动力，利用大链轮上的挡杆使偏心轮重心上移的传动系统。

The machine is the transmission system with motor as power that transmits drive through gear reducer, sprockets, and uses the rod on big sprocket that makes the focus of partial ship moving upwardly.

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