The researchers found that the dogs were able to pick the angry or happy face by touching a picture of it with their noses more often than one would expect by random chance.
研究人员发现，狗能够通过用鼻子触碰图片，来选择愤怒或快乐的面孔，其概率超过了人们对随机性的预期。
On average, every happy friend you have increases your chance of being happy by 9 percent.
一般来说，你的每个快乐的朋友能增加你9%的幸福。
On average, every happy person in your social network increases your own chance of cheer by 9 percent — and the effects of catching someone else’s happiness lasts up to one year.
平均来说，每一个你社会网中的快乐份子都可能增加你9%的快乐指数-而且这种快乐会持续一年之久。
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