Such a system should be considerably easier to understand than the human brain, a structure with billions of neurons, 100, 000 miles of biological wiring and 100 trillion synapses.

用这样的系统研究人脑的数十亿个神经元、十万英里的生物线和一百万亿的突触就相对容易了。

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Some airlines, including Southwest, are also simply answering customer demand that frequent-flier miles be easier to cash in.

WSJ: Frequent-Flier Miles: Best Airlines for Cashing In

The research unearths a tip for travelers having trouble using their frequent-flier miles: It might be easier to get "free" tickets using miles on low-fare carriers than it is on big carriers with global networks.

WSJ: For Frequent Fliers, a Ranking of the Stingiest Airlines