To see why, consider one of the things it takes to become an ace at, say, World of Warcraft, a hugely popular online fantasy game inhabited by griffins, trolls and other mythical creatures.

• 为什么呢？让我们来看看“魔兽世界”，一个非常流行的在线奇幻游戏，一个充斥着狮鹫，巨魔和其他神奇的生物的世界。