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。
A moment later, the Class 4 runner fell and hurt his leg, but he quickly got up and went on running.
过了一会儿,4班的运动员摔倒了,伤了腿,但是他很快爬起来,继续往前跑。