The compressibility of upper heavier fluid is a stable factor, while the compressibility of lower lighter fluid is an instable factor.
上层重流体的可压缩性是稳定因素，而下层轻流体的可压缩性是失稳因素。
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；
Operative methods include cervical disk excision, cervical inter-body fusion and bone grafting and inner fixation, instable factor elimination. But eligible condition is relatively short.
手术治疗的方法主要是颈椎间盘摘除，融合植骨内固定，消除失稳因素，但其适应证相对较窄。
Data is the most instable and complicated factor as well as the important resource in management system.
数据是管理系统中的重要资源，也是系统中最不稳定和最复杂的因素。
Data is the most instable and complicated factor as well as the important resource in management system.
数据是管理系统中的重要资源，也是系统中最不稳定和最复杂的因素。
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