Spontaneous model with intervertebral disc degeneration was the balance of unstability in modal function, while the effect of genetic factor could change this balance and accelerate the degeneration.

自发间盘退变的动物模型主要是间盘形态功能之间不稳定的平衡，遗传因素的影响可以改变这种平衡而加速退变。

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A design method on level swing beam disc plough was put forward by designing and calculating of level swing beam mechanism, side force balance mechanism and overall parameters.

通过对水平摆式圆盘犁的水平机构、机组侧向力平衡机构、机组整体参数的设计计算，提出水平摆式圆盘犁的设计方法。

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Divide control facial disc, digital timer electronic balance control.

隔膜控制面盘，数字计时器电子平衡控制。

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