Do you often go to the zoo? 你见过动物们体检吗？Of course, animals also need checkups! 北京动物园一年一度的动物体检日又到了。Let's see how they do it. A group of penguins run to the scales. They didn't do much sport in the hot summer days. 企鹅们都觉得自己长胖了不少...