What's the use of worrying about it

昨日复习：

Only five people turned up.

美 [ ˈoʊnli / faɪv / ˈpiːp(ə)l / tɜːrnd / ʌp ]

只来了五个人。

今日课程：

What's the use of worrying about it?

美 [ wʌts / ðə / juːz / əv / ˈwɜːriɪŋ / əˈbaʊt / ɪt ]

担心这个有什么用呢？