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。
Suddenly, there was a slight trembling sound from below, and the captain went down to see what had happened.
突然,从船舱下部传来一声微颤音,船长走下船舱去查看究竟。