for fun(或 for the fun of it)in order to amuse oneself and not for any more serious purpose
fun and games 有趣的活动，开心的玩乐
pleasure, delight, rapture, enjoyment, joy, fun这些名词均含"愉快，快乐，高兴"之意。
Life isn't all fun; it has its bad moments.人生不仅有乐趣, 也有令人不快的时刻.
I had great fun playing cards with them.我和他们玩纸牌玩得非常高兴.
Why didn't you come to my rescue when they were making fun of me?他们拿我开玩笑,你怎么不来为我解围?
Jacelin missed out all the fun because of his broken leg.杰斯林因为腿骨折而错过了享受这一切乐趣的机会.
Time flies when you're having fun.开心的时光总是飞逝而去。
When it is made fun and enjoyable to kids.出自-2016年6月阅读原文
Companies, marketers and teachers have long looked for fun ways to engage people's reward-seeking or competitive spirits.出自-2016年12月阅读原文
Those who use self-defeating humor,making fun of themselves, of the enjoyment of others, tend to maintain that hostility toward themselves even when alone.出自-2013年12月听力原文
According to the report's key findings, the proportion who say they ‘hardly ever' read for fun has gone from 8 percent of 13-year-olds.2018年高考英语全国卷2 阅读理解