Burst out laughing 突然大笑起来burst 爆发;突发laugh 笑1. The baby burst out laughing when he saw the cat slip. 这个婴儿看到猫滑倒了,突然大笑起来。2. The kids burst out laughing when the clown fell down on stage.孩子们看到小丑在台上摔倒以后,大笑了起来。Burst into laughterLaughter n.笑;笑声3. He burst into laughter when he turned around and saw his “bride” .他转身看到他的“新娘”以后,大笑了起来。