long lifetimelɔŋˈlaifˌtaim短语⁷⁰⁰²⁰ 基本例句 长寿命 Application of this new technique can effectively prevent the large broaches from deforming and cracking, and ensure the large broaches to obtain the high hardness, good resistance and long lifetime. 采用该工艺既可防止拉刀的变形和开裂，又可确保拉刀具有高的硬度、良好的耐磨性和使用寿命。 chemyq