远在史前时代,人类就将一些工作交给狗,而它们则把执掌自己生命的权力给了人类,以换取食物和住所。在人类不断拓展才能的过程中,狗总陪伴左右,它们先是用视觉和嗅觉帮我们狩猎,后来又为我们看管家畜和财物,现在,它们已深入到人类生活的方方面面,成为我们可以相互依赖的密 Far in prehistoric times, humans gave some work to dogs, and they gave humankind the power to control their own lives in exchange for food and shelter. As humans continue to expand their talents, dogs always accompany us. They first help us hunt with vision and sense of smell, and later we care for livestock and property. Now they have gone deep into all aspects of human life and become interdependent dense