METF

例句：

1. 1. The metal fatigue caused the bridge to collapse.
   金属疲劳导致桥梁坍塌。
2. 2. The metal fatigue is a common problem in the manufacturing industry.
   金属疲劳是制造业中常见的问题。
3. 3. The metal fatigue can be caused by overloading or under-cooling.
   金属疲劳可能由过载或过冷引起。