amusement, recreation, entertainment和fun的区别？

amusement
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n.
1. 乐趣;兴味[U]
To our amusement, the actor jumped on and off the stage.
令我们感到有趣的是,那个演员从舞台跳上跳下。
2. 娱乐,消遣;娱乐活动[C][U]
Reading and seeing movies are among my amusements.
阅读和看电影也是我的娱乐活动。
They often sing for their own amusement.
他们常常唱歌自娱。

recreation
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n.[C][U]
1. 消遣;娱乐,游戏
I regard reading as a form of recreation.
我把看书当作一种消遣。
2. (身心的)休养

entertainment
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n.
1. 招待,款待[U]
We are delighted in entertainment of our friends.
我们喜欢款待朋友。
2. 游艺,演艺;余兴[U][C]
She played the piano for our entertainment.
她弹钢琴为我们助兴。
3. 娱乐,消遣[U][C]
This law applies to all places of public entertainment.
这一法律适用于一切公共娱乐场所。
4. 怀有(希望,怀疑等)[U][(+of)]

fun
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n.[U]
1. 娱乐,乐趣
What fun we had!
我们玩得多开心!
2. 玩笑,嬉戏
His uncle is fond of fun.
他的叔父喜欢开玩笑。