The motion can be of large amplitude, and the free surface condition is linear.
运动可以是大振幅的，但自由面条件是线性的。
If you make the amplitude too large, then you get permanent deformation of the spring.
如果振幅过大，会让弹簧，永久损伤。
If you make the amplitude too large, then you get permanent deformation of the spring.
如果振幅过大，会让弹簧，永久损伤。
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