The strengthening behavior of glass possessing permanent stress during ion exchange has been discussed.

本文讨论了具有淬冷应力的玻璃样品在离子交换过程中的增强行为。

youdao

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.

由于这种钢化内应力是一种永久应力，随着产品运行时间的延伸，它不会产生内应力衰减现象。

youdao

Instead, declining grades only predicted worse stress hormones among students who believed that worsening grades were a permanent and hopeless state of affairs.

相反，对于那些认为成绩下降是一种永久的、无法挽回的状态的学生来说，成绩的下降只会预兆着他们应激激素的上升。

youdao

Dr Bockting says a more appropriate standard for new identity documents would be evidence the role change is permanent and medically necessary to relieve the stress would-be transgender people experience from the conflict between their gender identity and their birth sex.

BBC: Transgender Americans take on New York