Peter Tyson works for the science magazine NOVA. He explains why there are so many kinds of dogs
彼得泰森在科学杂志NOVA工作。
Dogs are trained to work with humans in many ways. But humans also breed dogs for something other than work. Peter Tyson of NOVA explains.
人们还训练狗做很多其他事情。但是并不是人们培育的所有的狗都是用来干活的。NOVA杂志彼得·泰森解释道。
Dogs are trained to work with humans in many ways. But humans also breed dogs for something other than work. Peter Tyson of NOVA explains.
人们还训练狗做很多其他事情。但是并不是人们培育的所有的狗都是用来干活的。NOVA杂志彼得·泰森解释道。
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