过去科学家们认为人们驯服猫是为了捉老鼠和保护谷物。
Scientists used to believe that people tamed cats to catch mice and protect the grain.
也就是说，如果我们认为婴儿宝宝喜欢品尝甜甜的味道，那么同理于一样的快乐表显方式，老鼠们也一定喜欢这种味道了噢。
Their brain reactions also mirror one another. If we believe the infant "enjoys" the sweet taste based on her pleasant expression, it follows that the rat likely enjoys it too.
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