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。

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Duke Provost Peter Lange said his school won't award credit to its own students or to others who enroll in its Bioelectricity and Genetics classes online, two of the Coursera options that ACE has recommended for credit.

WSJ: Big MOOC Coursera Moves Closer to Academic Acceptance