单词：prothistorian
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VOA Learning English presents America's Presidents. Today we are talking about George Washington. He was the first president of the United States. He served from 1789 to 1797. But he had many other accomplishments, too. He owned thousands of hectares
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Protamine sulfate is a drug that reverses the anticoagulant effects of liver compounds such as heparin. Protamine is extracted from the sperm of salmon and other species of fish, and then made into a protamine sulfate injection which is a necessary d
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