outbreak

outbreak
/ˈautbreɪk; `aʊtˌbrek/ n
sudden appearance or start (esp of disease or violence) 爆发, 突然发生, 发作（尤指疾病或暴力行为）
    an outbreak of typhoid, hostilities, rioting 伤寒的发作、 战争的爆发、 暴乱的发生.

牛津英汉双解词典