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1·It wasn't serious—it was all done in fun.

那不是认真的，全是闹着玩的。《牛津词典》

2·You can learn English in fun.

你可以在趣味中学习英语。

3·I'm not saying it in fun.

我讲这话不是开玩笑的。《新英汉大辞典》

4·The monkey thought 'TWAS all in fun.

猴子认为这是很有趣的。

5·He said so only in fun.

他这样说只是开开玩笑。

6·Have little energy and no interest in fun activities?

毫无动力并且对有趣的活动不感兴趣。

7·“ Multi-tasking is a moral weakness”, is of course all in fun.

“多任务并行是道德上的一个缺憾”，当然这是一句玩笑话。

8·More than 2000 children and their parents are expected to join in fun exercise programmes with the help of a team of physical education teachers.

在一组体育教师指导下，预计将有2000多名儿童和家长参加趣味体育项目。

9·Rebecca Miller, a 20-year-old British girl from Newcastle, who now lives in Shanghai and hosts Learning Chinese in Fun on local TV, was full of expectations about the Shanghai Expo.

在上海居住着一位来自纽卡斯尔的20岁英国姑娘丽贝卡，她去年与美国、德国、加拿大等地的年轻人一起在上海参加了《冲刺，上海！ 》“真人秀”电视节目，向境外游客和常住上海的外籍人士介绍真实而富有趣味的上海，现在她是上海广播电视台外语频道“乐学中文”节目的主持人。

10·There is just not enough fun and frivolity in culture today.

当今文化中太缺少乐趣和轻松。《柯林斯英汉双解大词典》