They change the mood in the music either from sad to happy or the other way around.

他们在音乐中情绪从悲伤变成快乐或者相反。

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But it will keep you in a happy, productive mood today.

但是它将会使你今天保持快乐和多产的心情。

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When the person who serve you food or cook the food is in a happy mood naturally it will reflect in the food he is preparing.

当一个供应食品的人或厨师有愉快的心情，自然地，那就会反映在他准备的食物上。

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And one of the just striking things is that Socrates is in a very happy, indeed jovial, mood, joking with his friends.

但是,奇怪的是,苏格拉底当时非常开心,甚至兴奋地和他的朋友们开玩笑

耶鲁公开课 - 死亡课程节选

With gold breaking out to new highs and the stock market in a happy mood, I doubt the Fed will be aggressive anytime soon.

FORBES: Looking Like Bear Prints Leading Us Into October

Heading into this weekend, are you in a happy or angry mood?

FORBES: Reasons To Feel Happy--And Angry

Anderson's return has coincided with the arrival of the players' wives and girlfriends on the tour and Strauss reports that the mood is "very happy" in the England camp.

BBC: Ashes: Andrew Strauss backs James Anderson to shine