We call it the fun theory.

我们称之为“乐趣理论”。

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The Hapgood Theory might sound like fun, but it has been discredited more times than I've had cups of tea.

这个理论就是哈普·古德理论，听起来好像蛮有趣的，不过这个理论被质疑的次数比我喝的茶的杯数还要多。

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Scientists have come up with a theory for why time flies when you are having fun — and drags when you are bored.

科学家们提出理论依据，解释为什么当你玩得开心的时候，时间总是过得飞快，而当你无聊的时侯，时间却过得特别慢。

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Now one reason it's a fun class, is the nice thing about teaching Game Theory quieten down folks- one thing about teaching Game Theory is, you get to play games, and that's exactly what we've just been doing now.

为什么这门课很有趣,因为学习博弈论,大家安静一下,在课堂上我们通过一些游戏来学习博弈,我们不刚做完一个游戏吗

耶鲁公开课 - 博弈论课程节选

And one of my favorites, the Volkswagen fun theory, inspired some positive social re-engineering by using play as the motivator to behavior change.

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His theory was that by letting them see the fun side of the iPad, they would get attached.

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Mersenne primes are most relevant to number theory, but most participants join Gimps for the fun of having a role in real research - and the chance of finding a new Mersenne prime.

BBC: NEWS | Science/Nature | Largest Prime Number discovered