单词：ill conditioned system of equations
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Unwritten这首歌，是Natasha为自己14岁的弟弟创作的一首歌曲，主题励志，鼓励人们做生命的主人，被电视剧电影多次引作插曲或主题曲。这首歌作为林志玲潘婷的广告背景音乐，似乎也有种天作
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Passage 40 How High Can You Jump? Flea trainers have observed a strange habit of fleas while training them. Fleas are trained by putting them in a cardboard box with a top on it. The fleas will jump up and hit the top of the cardboard box over and o
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Say it with us: Kids today have it sooooo easy. A new smartphone app will do their math homework for them, provided it's not too complicated. PhotoMath by microblink uses a phone's camera to solve equations and then teaches you the step-by-step metho
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