Dogs can learn to recognize smiles, a study indicates：

来源: kingfish2010 于 2017-03-26 00:55:16 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (248 bytes)

http://www.livescience.com/14728-dog-smile-facial-expression-communication.html哈哈

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