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In Dublin's fair city Where girls are so pretty 'Twas there I first met With sweet Molly Malone She drove a wheelbarrow Through the streets broad and narrow Crying,
迪斯尼儿歌第四集
Transcript by myconsent (special thanks to fionainnicemood) Out of the Blue Ridge Mountains in northwest Georgia, the cold waters of the Conasauga River descend toward Tennessee. Flowing back and forth across the state line, the River's abundant wil
国家地理2008年
This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. Spending your life hanging out at the seaside might sound like easy living. But for marine mussels, a day at the shore is no walk on the beach. Clinging
Scientific American(十)月
This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. The common method of closing a surgical incision is simply to stitch the patient up. There are some issues, though. Good stitching can be challenging,
Scientific American(四)月
Out of the Blue Ridge Mountains in northwest Georgia, the cold waters of the Conasauga River descend toward Tennessee. Flowing back and forth across the state line, the River's abundant wildlife and unspoiled beauty is a remnant of the past--a fading
自然百科2008年
3月22日是第18个世界水日。从这一天开始为期一周的时间，将是第23届中国水周。人类目前能够利用的淡水资源只占全球水资源总量的0.26%，其中70%以上被冻结在南极和北极的冰盖中，加上难以
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