erupt  
verb [ I ] uk/ɪˈrʌpt/ us/ɪˈrʌpt/
  (VOLCANO)      
 C2 (火山)喷发,爆发
When a volcano erupts, it explodes and flames and rocks come out of it.
  Since the volcano last erupted, many houses have been built in a dangerous position on its slopes. 自从火山上次喷发后,很多房屋建在了火山山坡上的危险地带。 
 - More examples
 - Inner-city riots erupted when a local man was shot by police.
 - Violence erupted in the city on Friday night.
 - A big diplomatic row erupted as a result.
 - Spontaneous demonstrations erupt almost daily.
 - A legal fight has erupted between two of the world's largest oil companies.
 
  (START SUDDENLY)            
 突然发生
to start suddenly and violently
  At the end of a hot summer, violence erupted in the inner cities. 一个炎热的夏末,在市中心贫民区突然爆发了暴力事件。 
  (感情的)爆发;剧烈地表达(感情)
to suddenly express your feelings in a noisy way
  The crowd erupted in applause and cheering. 人群中爆发出掌声和欢呼。 
  (疱疹)突然出现
If spots erupt on your skin, they suddenly appear.
  Two days after he'd been exposed to the substance, a painful rash erupted on his neck. 接触了这种物质两天后,他脖子上突然起了一种刺痛的皮疹。