Happiness leads to everything
If you're happy, you'll be successful
If you're happy, you'll get what you want
This boils down to the fact
that happiness is the key to everything
快乐通向一切美好的事物
快乐的人，更容易成功
快乐的人，会得偿所愿
这可以浓缩为一句话：
快乐是打开一切大门的钥匙
(红色部分不被强调)