单词：chain-float liquid-level ga(u)ge
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If blood didnt circulate through our bodies, carrying oxygen and nutrients, we wouldnt be able to live. Blood is so important to life that the body constantly makes new blood. To do this, the body must produce the liquid part of blood, called plasma,
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Food Chain 食物链 The food chain is a natural system. 食物链是自然系统。 The first level of the food chain consists of plants. 食物链的第一级由植物组成。 These plants are major food for grass-eating animals. 这些植物是食草
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By Margaret Besheer United Nations 24 September 2009 President Barack Obama addresses the United Nations General Assembly, New York, 23 Sep 2009 World leaders addressing the U.N. General Assembly underscored issues of domestic and international conc
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GadhafiLoyalistsFleeinConvoytoNiger Reports that a large convoy of Moammar Gadhafi's supporters has fled Libya for Niger have angered many in the Libyan capital. Citizens want to see their former leader and those around him facing justice at home. A
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Libya Faces Economic Challenges in Post-Gadhafi Era Moammar Gadhafi is dead, but Libyans still face many difficulties now that their long time leader is gone, including how to repair a battered economy. Before the uprisings, Libya produced roughly 1.
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17 Into the Troposphere 第十七章 进入对流层 Thank goodness for the atmosphere. It keeps us warm. 谢天谢地，我们有了大气。它使我们有了个温暖的环境。 Without it, Earth would be a lifeless ball of ice with an average te
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