This is followed, over time, by a permanentelongation of the eye.
时间一久，随之而来的是视力永久的伸长。
2
A distinction is made between elongation and break, permanentelongation and elastic elongation.
这样就构成了拉伸与崩断以及永恒延伸和弹性延伸的区别。
3
As this toughened internal stress is a kind of permanent stress, it can not produce the internal stress attenuation with elongation of the product service time.