belly laugh       
noun [ C ] uk/ˈbel.i ˌlɑːf/ us/ˈbel.i ˌlæf/
 捧腹大笑
a loud, uncontrolled laugh
  I've never heard Robin laugh like that - it was a real belly laugh. 我从没见过罗宾那样笑——那是真正的捧腹大笑。 
 
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