Putting on a happyface not only helps us make friends but also makes us feel better.
面带笑容不仅能帮我们交朋友，还能让我们感觉更美妙。
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The researchers found that the dogs were able to pick the angry or happyface 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。
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Simply putting on a happyface, as the classic song lyric advises, can make a difference.