Tim is the only child ,Sam is only a child ,who has no a brother or a sister?

题目

Tim is the only child ,Sam is only a child ,who has no a brother or a sister?
why?

答案

Tim
Tim is the only child 意思是说Tim是唯一的一个孩子
而Sam is only a child 是说Sam仅仅是个孩子
由此推断,Tim肯定没有兄弟姐妹