翻译：
他听到故事,不禁失声痛哭.
crack的含义：
（指嗓音）突然而失控地改变音色﹑ 音量等:
In a voice cracking with emotion,he announced the death of his father.
他悲恸失声地宣布了父亲去世的消息.
A boy's voice cracks (ie becomes deeper) at puberty.
男孩在青春期嗓音改变（声音变粗）.