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。
What is needed in the case of noise is a study of large numbers of people living under noisy conditions,
对于噪音问题,需要对大量生活在噪音中的人进行研究,