人们是怎么知道地球是圆的的？你也许会说是哥伦布航海发现的，但其实远在古希腊时期就有了地球是圆的的理论。 从船上的?t望台能看到在甲板上看不到的远方，月相变化，时差的产生，不同地方的人能看到不同的星空等等，这些都表明地球是圆的。 这本英语原版科普绘本提供了丰富有趣的知识，穿越历史，进入太空，启发孩子观察、思考有关地球形状的现象与知识，培养孩子独立思考的精神。 书后有简单的小实验，引导孩子自己动手、观察。
You’re deep inside an endangered habitat. In the blue waters ofsouthern Florida you come face to face with nature’s gentle giant.Meet the manatee. He’s playful, sometimes clumsy, and he rollsaround when he’s happy. Hear that?! He just squealed with delight.Learn why his world is under threat from pollution and development,and what young environmentalists can do to protect that world.Brian Skerry’s astonishing photographs and amazing first-handadventures reveal the world of the manatee as never before. .
