A movement from and back to a mean position or axis in an oscillating or alternating motion.
A movement from and back to a mean position or axis in an oscillating or alternating motion.
移动从中间位置或轴线向外或向后的振荡或依次的运动
A movement from and back to a mean position or axis in an oscillating or alternating motion.
移动从中间位置或轴线向外或向后的振荡或依次的运动