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气候变化的妥协(1)
气候变化的妥协 Hints: Copenhagen Denmark the United States China India Brazil South Africa Obama carbon dioxide degrees Celsius Almost 200 countries met for two weeks at a United Nations confere...
音乐教育计划(1)
“Imizamo Yethu”是参加胡特湾音乐节项目的儿童的家园。它给予那些孩子欣赏音乐的机会。Hout Bay is a beautiful place, 50 miles outside of Cape Town. Today, it has all kinds of socio-economic groups a...
远程WI-FI(1)
他们的发明之一是以无线上网为基础的长途网,或者叫远程网络无线保真技术... Eric Brewer is a busy man. He is a computer science professor at the University of California, Berkeley. He is also directo...
天然染料(1)
自古以来人们就开始使用天然染料。这些是自然的,无公害的,绿色的染料Dye can bring a little color to life. Most clothing is colored with dyes. Modern, manufactured dyes can be costly. Natural dyes f...