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1·There were roars of laughter as he stood up.

他站起来时出现阵阵哄堂大笑。《柯林斯英汉双解大词典》

2·Everybody broke into roars of laughter.

大家哄堂大笑起来。

3·Roars of laughter exploded all around the common room; people clutched their cheeks and held on to nearby sofas for support.

休息室里爆发出一阵大笑，大家捂着腮帮子，纷纷笑倒在沙发上。