1. 突然笑起来：burn up (炉火等)烧旺起来 | burst into laughter 突然笑起来 | burst into 闯入;突然发作
2. 突然笑出声来：in silence 在沉默中 | burst into laughter 突然笑出声来 | concentrate on ... 全神贯注于...
3. 哈哈大笑起来：迟早 sooner or later | 哈哈大笑起来 burst into laughter | 制定一条法律 make a law
4. 突然大笑：burst into laughter 突然大笑 | crack a smile 展颜微笑,莞尔一笑 | explode with laughter 哄堂大笑