你想想, 這個聲音就像在媽媽肚的"gu lu gu lu" 聱...之前看過一個方法是"給小孩聽電視機的sa sa聱" 相信原理一樣, 是"媽媽肚的聲音啊...

have u tried it?

試過，即收聲即瞓！

Is this still working for you?