Dogs are especially good at sensing movement. The increased number of rods in the dogs retina also increases their ability to detect motion, Sypniewski says. This ability can help them detect small prey1 like squirrels.狗特别善于感知运动。西普尼夫斯基说：狗的视网膜中视杆细胞数目多，这使得它们察看运动的能力更强。这种能力可以帮助它们发现像松鼠等小猎物。Dogs have a wider field of vision than humans. Dogs eyes are set slightly farther apart than humans eyes, so they can see further to the side in each direction.狗的视线比人类更广。狗比人的眼间距稍远，因此它们可以在每一个方向上看得更远。Dogs have blurrier long-distance vision than humans. A human with perfect vision has 20/20 vision, while dogs have 20/65 to 20/85. This means that a dog must be at 20 ft. to read a letter that a human with 20/20 vision would be able to read at 65 or 85 ft., says Sypniewski.狗的远距离视力比人类更模糊。拥有完美视力的人类有20/20的视力，而狗有20/65至20/85的视力。这意味着狗需要在20英尺（约合6米）处才能看见一个拥有20/20视力的人类在65或85英尺处能看到的字。Dogs have trouble seeing things very close up. Dogs can see objects clearly if theyre at least 13 to 20 inches away from their eyes, but if the object is closer, the image may be blurry, Sypniewski says. Humans can see objects slightly closer about 10 inches away from the eye.狗非常难近距离察看事物。当物体距离双眼至少13到20英寸（约0.3到0.5米）远时，狗狗能看了解，但假如物体更近，眼中的图像可能就会模糊不清。人类可以看到更近的物体，大约到10英寸（0.25米）远。Dogs may recognize you by your shape and motion. If your dog recognizes you from a distance, it is not because it can see the details of your face like a human would, but rather because of your shape or the way you move, Neitz says.狗可以通过身形和动作识人。内茨说：假如你的狗能从远处认出你，那不是由于它能像人类一样看了解你的脸，而是由于认出你的身形或移动方法。
点击收听单词发音
1 prey n.被掠食者，牺牲者，掠食；v.捕食，掠夺，折磨 参考例句： Stronger animals prey on weaker ones.弱肉强食。 The lion was hunting for its prey.狮子在探寻猎物。
相关文章推荐
