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If you need help herding some sheep or retrieving a stick, you can count on your canine companion. Because dogs always seem to be keen on lending a paw. 如果你需要放羊或者捡回个棍子，你可以让狗狗去做这些事情。因为狗狗非常喜欢帮助你。 But only if their partner is a person. When it comes to cooperating with one another, dogs are truly lost…and instead it's wolves who've mastered the art of teamwork. That's according to a study in the Proceedings of the National Academy of Sciences. 但是，前提条件是狗狗的合作对象是人，如果是和别的什么合作的话，狗狗会不知所措……而相反，狼却有团队合作的精神。这是发表在《美国科学院论文集》杂志上的一项研究指出的。 For thousands of years, humans have been breeding dogs that can do all sorts of neat tricks. And because pups aim to please, we've come to think that domestication has somehow boosted dogs' powers of cooperation. 数千年以来，人类一直饲养可以掌握各种技能的狗狗。因为，小狗狗的目的是取悦人类，所以，我们认为驯化狗狗可以提高狗狗的合作能力。 | 
