快乐的英文：
happy
merry

参考例句：

Jolly dog
快乐的人

Anticipating pleasure is also a pleasure. ——Friedrich Schiller
期望快乐本身也是一种快乐。——席勒

frank enjoyment.
不加掩饰的快乐

Happy Christmas!
祝你圣诞节快乐!

a look expressive of great joy
表现极大快乐的神色

Have a happy anniversary!
结婚周年快乐!

The unaffected delight of a child
孩童的天真快乐

a cheery hello; a gay sunny room; a sunny smile.
快乐的招呼；一个快乐的、充满阳光的房间；充满阳光的微笑。

Anticipating pleasure is also a pleasure.--Friedrich Schiller.German dramatist and pelt
预期快乐本身也是一种快乐。德国剧作家、诗人席勒

How lucky I am to work with you! Happy Valentine's Day.
能与你共事多么幸运！情人节快乐。

happy是什么意思：
adj. 高兴的；使人高兴的；情愿的；放心的；幸运的；恰当的

Health is happiness
健康就是幸福

Content is happiness
知足常乐

Then Zara was happy.
然后扎拉就高兴起来了。

Commonness is happiness.
平凡是福。

A happy parent makes for a happy child.
有快乐的父母，才会有快乐的孩子。

merry是什么意思：
adj. 快乐的，愉快的，嬉戏作乐的

A merry heart has a continual feast.
一颗愉快的心会享受到接连不断的节日。

Merry is he that has nought to lose
人无所失,不亦乐乎

It is good to be merry at meal
席间心情愉快是为上策

A merry heart makes a cheerful countenance
人逢喜事精神爽

The merriness of the music affected everyone in the room.
屋子里的每个人都被音乐的欢快所感染。