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Our Healthy World

Jane Forbes

出版	Rubicon Publishing, Incorporated, 2013-10-15
主題	Science / General
ISBN	17705873229781770587328
URL	http://books.google.com.hk/books?id=wI3goAEACAAJ&hl=&source=gbs_api

註釋

Natural resources come from Earth. We need natural resources. It is important to take care of them and not use them up. Taking care of natural resources is called conservation.