[机] bubbling of gas through liquid

jiāng qì tǐ chéng pào chuī guò yè tǐ ㄐㄧㄤ ㄑㄧˋ ㄊㄧˇ ㄔㄥˊ ㄆㄠˋ ㄔㄨㄟ ㄍㄨㄛˋ ㄧㄝˋ ㄊㄧˇ