the tall man who is playing basketball is yaoming.为什么要加who 不加不是更容易理解?

the tall man who is playing basketball is yaoming.为什么要加who 不加不是更容易理解?
the tall man who is playing basketball is yaoming.为什么要加who 不加不是更容易理解?

the tall man who is playing basketball is yaoming.为什么要加who 不加不是更容易理解?
who的存在是为了强调那个高大的人（名词）的,那个在玩篮球的高大的人是姚明
望及时采纳,有建议请提出,