但 Werbach 说，“游戏化”这个词和这个概念的广泛、有意识的应用是在大约五年前才真正开始的。

But the word "gamification" and the widespread, conscious application of the concept only began in earnest about five years ago, Werbach says.

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大约五年前，美国高三学生每天花在电子设备上的时间一般超过六小时。

Some five years ago, high school seniors in America generally spent more than six hours a day on electronic devices.

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大约五年前才开始做些海外生意。

We did very little up till about five years ago.

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The latest was just found another five years or so.

最近一个是大约在五年前找到的

耶鲁公开课 - 美国内战与重建课程节选