By studying the transition between the panting of chimps and the human ha-ha, scientists discovered that breath control is the key to the emergence of both human laughter and speech.

• 通过研究从大猩猩喘气的呼呼声到人类“哈哈”的笑声两者之间的转化，科学家发现，呼吸控制是人类语音和笑声出现的要害所在。