单词：self sharpening blade
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Wheres Sally, Jack? Shes in the garden, Jane. Whats she doing? Shes sitting under the tree. Is Tim in the garden, too? Yes, he is. Hes climbing the tree. I beg your pardon? Whos climbing the tree. Tim is. What about the dog? The dogs in the garden,
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Bladeless Wind Generator Safe for Birds Wind turbines are tall structures with large blades used to produce electricity. They are useful sources of low-cost, renewable energy. But they can also be deadly to birds and bats. The turbines large blades t
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Bird-friendly Bladeless Wind Turbine Mimics Nature Energy created by conventional three-blade wind turbines is cheap, sustainable and pollution-free. But according to current estimates, the devices' fast-moving blades kill up to 300,000 birds annuall
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名师分享六级作文阅卷标准，以2011年12月写作话题为例 2012年6月16日的四、六级考试将于本周六开考，新东方在线网络课堂四、六级作文辅导名师王兆飞以去年12月六级写作话题为例，为广大考
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Long Conversations A: Helen: Victor, there's a good review of your article on pollution in today's paper. Victor: Really? Maybe I should go pick up a few extra copies. Helen: Do you have change? Victor: No! I'm totally broke as usual. But I did notic
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