The fatigue failure has been considered as torsion bar spring are subject to periodic forces.
由于扭杆受到的是循环应力，因此设计时考虑了疲劳失效问题；
2
As the king of herb for periodic dip bathing — ginseng spring can supply vital force, invigorate spleen, benefit lung, generate saliva, stop cough, soothe nerves and benefits the kidney.