for fun

(或 for the fun of it)in order to amuse oneself and not for any more serious purpose

为了好玩儿，闹着玩儿地

fun and games

amusing and enjoyable activities

有趣的活动，开心的玩乐

teaching isn't all fun and games.

教学不是一天到晚搞有趣的活动。

someone's idea of fun

used to emphasize one's dislike for an activity or to mock someone else's liking for it

［用于表示不喜欢某事或嘲讽他人对某事的喜欢］

being stuck behind a desk all day &B{isn't my idea of fun}.

整天不能离开办公桌半步可不是好玩的。

in fun

not intended seriously; as a joke

不是当真的；开玩笑的

remember when you meet the press to say that your speech was all in fun.

你和报界人士见面时别忘了说清楚你那次讲话只是闹着玩儿的。

like fun

(dated, chiefly N. Amer.)an ironic exclamation of contradiction or disbelief in response to a statement

(旧，主北美，讽)决不会，哪里有这种事（表示反驳或不相信）

(Brit. archaic)vigorously or quickly

(英，古)有力地；很快地

the mill is blazing away like fun.

工厂燃起迅猛的熊熊大火。

make fun of

tease, laugh at, or joke about (someone) in a mocking or unkind way

取笑，嘲弄（某人）

not much (或 a lot of) fun

used to indicate that something strikes one as extremely unpleasant and depressing

［用于表示对某事感到极为不快］

it can't be much fun living next door to him.

与他为邻决非幸事。

what fun!

used to convey that an activity or situation sounds amusing or enjoyable

多么有趣！

for fun 或 in fun

As a joke; playfully.

寻找乐趣：开玩笑的；滑稽可笑的