99r视频

　　A journey through past, present, and future of the oceans. 　　How did life in the oceans originate billions of years ago? And how could the immense diversity of animals and plants that surround us today emerge out of the first organisms? What unknown species hide in deep, dark oceans? How are humans changing the oceans? And how can we exploit the riches of the oceans, without dest... (展开全部)