母亲从乡下背了两床七斤重的棉絮，坐火车、汽车，辗转而来。
His mother carried two bags of cotton from the countryside by bus and train to his city.
目的应用成角快速腰椎牵引床将腰椎处于屈曲或背伸的状态下牵引，对L4～5和L5～S1椎间盘突出症的疗法进行临床研究。
Objective To study the effect of rapid traction of flexion or stretch for the cases with L4~5 and L5~S1 of lumbar disc herniation.
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