是不可数名词。
vi. 开玩笑(非正式)n. 乐趣;玩笑We had a lot of fun that day.那天我们玩的很开心。It was such a fun movie.这真是一部有趣的电影。It could be fun to watch them.看他们会是乐趣。We're gonna have a lotta fun.我们将玩得非常开心。She's really fun to be with.和她在一起真开心。It's just a bit of harmless fun.开个小玩笑罢了,并无恶意的。