单词：community ecosystem
单词：community ecosystem 相关文章
Exhibit Highlights Butterfly's Beauty, Diversity, Value to Ecosystem Flying Canvases They are gentle, colorful creatures that move with grace and flair. And in a warm and humid enclosure at the Smithsonians National Museum of Natural History in Washi
VOA标准英语2013年(三月)
New York Bay Cleanup Focuses on Hindu Ritual Items The sound of gentle waves and the call of wild shorebirds are normally all you can hear on the shores of Jamaica Bay Wildlife Refuge, an oasis of nature just a few kilometers from the bustling urban
VOA标准英语2011年(四月)
This is Scientific Americans 60-second Science. Im Karen Hopkin, This will just take a minute. Have you ever said, I know it like the back of my hand? Well, how well do you know the back of your hand, or the back of your knee, or behind your ears? Pr
Scientific American(五)月
Study: Giving Local Fishermen Control Prevents Overfishing Exponential decay Tropical coral reefs are fertile fishing grounds for some 200 million small-scale fishers around the world. But many of these reefs are in decline. Tim McClanahan with the W
VOA标准英语2012年(四月)
Asian Carp now outnumber native fish in many areas of the United States and their expansion particularly threatens the fragile ecosystems of the Great Lakes. In an effort to control algae growth, catfish farmers in the southern United States introduc
VOA标准英语2010年(七)月
Kenya's ocean waters are home to five out of the world's eight species of turtles. All are classified as either endangered or critically endangered, and are threatened by poaching, fishing nets, development and pollution. The conservation groups Wata
VOA标准英语2010年(七)月