It is designed by a thirteen-year-old boy.
它是由一个年仅十三岁的男孩设计的。
I am a thirteen-year-old boy, and my name is Zhao Jie.
我是一个十三岁的男孩，名叫赵杰。
A thirteen-year-old boy was sitting on the sofa watching TV when the phone rang.
一个13岁的男孩正坐在沙发上看电视，这时电话响了。
A thirteen-year-old boy was sitting on the sofa watching TV when the telephone rang.
一位十三岁的小男孩正坐在沙发上看电视，突然电话铃响了起来。
A thirteen-year-old boy was sitting on the sofa watching TV when the telephone rang.
一位十三岁的小男孩正坐在沙发上看电视，突然电话铃响了起来。
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