《太平广记·卷四·神仙四》
就叫使者让那头兽叫一声听听看到底怎么样，使者就用手指着那兽让它叫一声，那兽伸出舌头舔了半天嘴唇，突然一声吼叫，声音大得像天空中响起一声响雷。
帝乃使使者敕猛兽发声，试听之。使者乃指兽，令发一声，兽舔唇良久，忽如天雷霹雳之响。
Let the envoy make the beast roar and see how it sounds. The envoy pointed at the beast to make it roar, and the beast stretched out its tongue and licked its lips for a long time before suddenly letting out a roar that sounded like thunder in the sky.