surfaces strengthening的用法和样例：
例句
- DC-pulsed plasma nitriding has been developed into an important technique for strengthening metallic materials.
脉冲直流等离子渗氮处理已成为金属材料表面强化的重要方法。 - For remanufacturing of shaft components, a used shaft is used as a work-piece and repaired and modified with advanced surface strengthening technology to realize regeneration.
轴类零件的再制造是以废旧的轴为毛坯，采用先进的表面强化技术等修复或改造废旧的轴，使之获得再生。
