From the Angle of Biomechanics, this paper makes analysis on action effect of forehand shot in tennis.
从生物力学的角度，对网球正手击球的动作效果进行分析与评价。
In order to prove water diversion and retarding action effect of permeable pile groins, the flow velocity formulas above and below the permeable pile groins are derived respectively.
为了验证井柱桩透水丁坝的分水缓流作用效果，建立单排井柱桩透水丁坝运行时的水量平衡方程，导出了单排井柱桩透水丁坝上下游流速公式。
In order to prove water diversion and retarding action effect of permeable pile groins, the flow velocity formulas above and below the permeable pile groins are derived respectively.
为了验证井柱桩透水丁坝的分水缓流作用效果，建立单排井柱桩透水丁坝运行时的水量平衡方程，导出了单排井柱桩透水丁坝上下游流速公式。
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