The second-order shear of the basic flow represents an instable factor for the symmetric disturbance, and drives the unstable mesoscale disturbance to travel in the meridional direction;
基流二次切变对于中尺度对称扰动来说是一个不稳定因子，并且驱动不稳定的中尺度对称扰动在南北方向传播；
Water potential reflects energy level of soil water and the gradient of water potential is an impotent factor describing direction and velocity of water flow.
水势反映土壤水的能态，而水势梯度则是决定水流方向和速度的重要因素。
Water potential reflects energy level of soil water and the gradient of water potential is an impotent factor describing direction and velocity of water flow.
水势反映土壤水的能态，而水势梯度则是决定水流方向和速度的重要因素。
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