You must develop the muscles of your speech organs to produce unfamiliar sounds.
所以你必须训练和发展你的发音器官(声带、舌、口、鼻腔等)的肌肉,以便发出陌生的(另外一种语言)声音。
No, Mrs Brown. Your son's trouble is very common these days. It happens all the time. It comes and goes very quickly. He'll get well soon.
是的,布朗太太。你儿子的毛病现在是极常见的,经常有的。它来得快,去得也快。他不久就会好的。