out·break /ˈaʊtbreɪk/ ●●○ noun [countableC] START TO HAPPEN, EXIST ETCif there is an outbreak of fighting or disease in an area, it suddenly starts to happen 〔战争或疾病的〕爆发,突然发生outbreak of outbreaks of fighting 战斗的爆发
the outbreak of World War II 第二次世界大战的爆发
→ break out at break1 outbreak of• the outbreak of World War II