It is man's best friend 是人类的好朋友
It seems the reproductive system of man's best friend is one of the mysteries of modern science.
人类最好的朋友的生殖系统似乎是现代科学的一个未解之谜。
It is a girl's best friend, and a symbol of a man's affection.
它是女孩子最好的朋友，也是男士们影响力的象征。
An old expression says, "Man's best friend is his dog." Today, however, it seems that cats have replaced dogs as the most popular pets in American homes.
一句老话这样说道：“人类最好的朋友就是他的狗”。然而今天，在美国家庭中，猫似乎已经取代了狗，成为最受欢迎的宠物。
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