belly 是“肚子”，belly laugh指“捧腹大笑”。

【例句】
Each gag was rewarded with a generous belly laugh. 
每一个笑料都引来一阵捧腹大笑。

This cartoon is so interesting that it makes us break into a lot of belly laugh.
这个动画是如此有趣，以至于我们好几次都大笑起来。