How did zebras get their stripes? It's hard to get a black-and-white answer. 斑马身上的条纹是如何形成的？我们很难得到确切的答案。 Some scientists say the stripes are a form of camouflage that protects zebras from hungry lion...
Why Do Zebras Have Stripes? For many animals, camouflage is an important part of survival. A leopards spotted coat and a polar bears white fur help them blend into their respective environments. But a zebras bold stripes cant help to disguise it in i...
Unit 5 Is this your schoolbag? [00:02.44]第五单元 这是你的书包吗？ [00:04.88]Lesson 25 Just speak [00:07.22]第二十五课 刚才的谈话 [00:09.56]Hey,boys and girls! [00:11.30]嘿，男孩和女孩！ [00:13.04]Don't leave your things...
