A standard one. Replacement during the first year if all rules for proper use have been followed.
有一个原则,如果在一年内符合各种使用规定,就可更换。
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。