Fatigue is a feeling of extreme physical or mental tiredness.
双语例句
例：
She continued to have severe stomach cramps, aches, fatigue, and depression.
她仍有严重的胃痉挛、疼痛、疲惫和抑郁症状。
2.?[U 不可数名词] 疲乏
You can say that people are suffering from a particular kind of fatigue when they have been doing something for a long time and feel they can no longer continue to do it.
双语例句
例：
compassion fatigue caused by endless TV and celebrity appeals.
电视节目和名人无休止的呼吁所引起的同情心疲劳。
3.?[U 不可数名词] （金属、木材的）疲劳
Fatigue in metal or wood is a weakness in it that is caused by repeated stress. Fatigue can cause the metal or wood to break.
双语例句
例：
The problem turned out to be metal fatigue in the fuselage.
问题原来出在机身的金属疲劳。
4.?[PL 复数] 军服
Fatigues are clothes that soldiers wear when they are fighting or when they are doing routine jobs.
双语例句
例：
He never expected to return home wearing combat fatigues.