回应这一节的问题：
What defines a game are the goal, the rules, the feedback system, and voluntary participation.
A compelling story makes the goal more enticing. Complex scoring metrics make the feedback systems more motivating. Achievements and levels multiply the opportunities for experiencing success ...作者详细描述了游戏为什么能吸引人的一些特点。
counterintuitive违反直觉的
It’s a bit counterintuitive to think about the future in terms of the past.
squelch压制；镇压
compelling / kəm'peliŋ /
vt.compel的变形
1强迫性的，强制性的
2引人注目的；令人信服的
enticing
adj.有吸引力的，引诱的，诱惑的，迷人的，诱人的，动人心的
Compared with games, reality is too easy. Games challenge us with voluntary obstacles and help us put our personal strengths to better use.与游戏相比，现实就是小case.
通过diverse examples,作者想说When we understand games in this light, the dark metaphors we use for talking about games are revealed to be the irrational fears they really are.In her opinions ,真正了解了游戏的特点和真谛，就能避免产生对游戏的一些“误解”。
How Games Provoke Positive Emotion？
A GOOD GAME is a unique way of structuring experience and provoking positive emotion. It is an extremely powerful tool for inspiring participation and motivating hard work.
归纳了一下游戏的优点：
the pleasure of actively investigating unfamiliar objects and spaces.
discovery work helps us feel confident, powerful, and motivated.
cooperation and feel more capable
enjoy the stimulation and activation.
enliven（使…有趣） rather than kill the time
