狗是人类忠实的朋友，他们对主人的感情是纯粹和真实的。
Dogs are men's loyal friends, their affection to master is pure and true.
狗是人类的朋友，不仅因为他们可爱，而且因为他们忠实于主人。
Dogs are friends of man not only because they are lovely but also because they are faithful to their master.
纵观历史，狗一直是人类忠实的朋友。
Throughout history, dogs are men's best friends all the time.
难怪说狗是人类最忠实的朋友。
It is no wonder that dog is the most loyal friend of human beings.
在猫和狗之间，你认为哪一个是人类的忠实朋友？
狗是人类最好、最忠实的朋友。
狗是人类最好、最忠实的朋友。
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