兩種都正確，壹種美式發音，壹種是英式發音。
fun
讀音：
英[f?n]
美[f?n]
釋義：
n. 樂趣；娛樂活動；嬉戲，嬉鬧；有趣的事
adj. 使人愉快的；開心的
vi. 嬉鬧；開玩笑
例句：
1、 It was great fun.
真好玩。
2、She got a lot of fun out of hiking.
她從徒步旅行中獲得了很多快樂。
3、 She'd had fun mimicking her aunt.
她模仿姑媽的樣子，覺得很開心。
4、This is a fabulous album. It's fresh, varied, fun.
這張專輯真棒，新穎、有趣且富於變化。
擴展資料：
習語
1、figure of fun
( someone who is laughed at ) 取笑的對象；嘲笑的對象
These teachers are figures of fun.
這些老師常被取笑。
2、for fun
( for enjoyment ) 為了好玩；鬧著玩兒
I took my M.A. just for fun really.
我讀文學碩士其實就是覺得好玩。
He had just come for the fun of it.
他來只是為了好玩兒。
3、fun and games
< 非正式,諷 > ( irresponsible playful behaviour ) 嬉鬧；兒戲；玩鬧
It wasn't all fun and games.
這可不光是鬧著玩的。