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。
'Your sister will be here in less than an hour and we must be at the station to meet her.
“再有不到一个小时你姐姐就要到这儿了,我们得去车站接她。