穆勒说：“对我们来说，最有可能的解释似乎是，这一现象的根源在于它们与人类生活在一起，这让它们接触了大量人类的面部表情。”而这种接触也为它们提供了很多机会来学习区分它们。
"To us, the most likely explanation appears to be that the basis lies in their living with humans, which gives them a lot of exposure to human facial expressions," and this exposure has provided them with many chances to learn to distinguish between them, Muller said.
去年，超过800,000名中国人和2百万美国人往返于我们两国之间，一起生活、工作和学习。
Last year, over 800, 000 Chinese and two million Americans traveled between our countries to live, work and study together.
那么，就让我们一起来直面生活中每天要遇到的“敌人”，学习怎么打败它吧！
Discover the face of this everyday enemy and learn how to win.
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