题目内容：

对某种动物或植物的英文简介
要是人类的朋友,对人类有贡献,要短一点

优质解答

Bears,unlike any other mammal,are born very small,much smaller than mammals of a similar size.In fact,when they are born,their weight is 10% of that of a mammal of similar size.The reason bears are bo...