What did you do to make yourself happy?

你做了什么让自己快乐？

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Do you know that the "Happy Birthday to You" song is the first song sung in outer space?

你知道吗？“祝你生日快乐”这首歌是在外太空唱的第一首歌。

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Why do you feel happy?

你为什么会感到开心呢？

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Sometimes he seems to be saying, "I'm not happy about anything, but what are you going to do about it?"

VOA: special.2010.01.17

But the question isn't really, is there something you could do to a human being ? so that he'd be happy, or at least enjoying himself, forever?

但问题并非，是否有办法改变人类,让他快乐或起码永远享受自己？

耶鲁公开课 - 死亡课程节选

I know that you have just graduated. So do you feel happy now?

我知道你刚毕业。那么你现在感到幸福吗？

寻找幸福 - SpeakingMax英语口语达人

Not only will you start building up a nest egg, you'll have more money for things that do make you happy, like handbags or trips to Spain.

BBC: NEWS | UK | Magazine | Money worries in your 20s? There may be a silver lining

Martin Seligman of the University of Pennsylvania noted that happiness grows in finding one's greatest talents, putting them at the center of one's life and working in a cause greater than oneself--at which point the pleasures of a crate of Godiva chocolates in the back of a Porsche really do make you happy.

FORBES: What A Billionaire (Really) Wants

If some day you do reach the happy position of achieving your retirement savings objectives, you can reduce stress even further by putting some of that money into a low-cost annuity that will guarantee you a certain level of income for the rest of your life (options that cover a surviving spouse, or are indexed for inflation, are available but reduce annual income).

FORBES: Retirement