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。
Family member Thanduxolo Mandela: "to him, life was all about service to others."
家庭成员詹·曼德拉：“对于他来说，生活就是为他人服务。”
Family member Thanduxolo Mandela: "to him, life was all about service to others."
家庭成员詹·曼德拉：“对于他来说，生活就是为他人服务。”
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