Great improvement has been brought about in the service life of springs by hot peening.
用锤头连续敲打金属表面的方法大大地延长了弹簧的使用寿命。
英汉双解词典包含483723条英汉词条,基本涵盖了全部常用单词的翻译及用法,是英语学习的有利工具。