work hardening

例句：

1. 1. The steel isundergoing work hardening to increase itsstrength.
   钢材正在经历工作硬化以提高其强度。
2. 2. The engineers are working hardeningthe design to meet the deadline.
   工程师们正在努力加强设计以满足截止日期。
3. 3. Thecompany is investing in work hardening toimprove its competitiveness.
   公司正在投资于工作硬化以提高其竞争力。