While the stress-strain curve of HOY was similar with that of POY, both have mini-neck drawn phenomenon. 而HOY(高取向丝)的应力一应变曲线与POY相似,存在明显的细颈拉伸现象。
Originally for age-related cervical disease is now to expand middle-aged, and even some middle school students often have headaches and dizziness, neck pain discomfort phenomenon. 原本为老年性的颈椎病现已向中青年扩展,甚至一些中学生也常有头痛头晕,颈项酸痛不适的现象。