unstable motion

基本解释

An “interbody fusion” is a bony bridge that “welds” the two vertebral bodies together to stop unstable motion.
“椎体融合术”就是将两个脊椎连接起来防止脊椎不稳定的手术。
The results show that the vortex motion is unstable for small three-dimensional disturbances in the separated wake of a circular cylinder.
结果表明，圆柱分离尾迹中的旋涡存在三维不稳定性。
The response results show that there are three ways leading to chaos: quasi-periodic bifurcation, intermittent bifurcation and unstable period-3 motion.
由结果发现：响应进入混沌的道路有拟周期环面破裂、周期3运动失稳和阵发性混沌进入混沌三条。