单词：industrial mask
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This is the VOA Special English Agriculture Report. Soil naturally contains harmless amounts of lead, along with other metals. Because of pollution, however, the amounts are higher the closer you get to cities and towns. But experts say this should
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Before you next flush the toilet, consider this: Scientists in Singapore have developed battery powered by（用…推动的） urine（尿）. 下次冲厕所之前，请不要忘记下面的介绍：新
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The game of baseball was the undisputed national pastime for more than a century, until American football overtook it as the nation's most popular and profitable sport. These are four baseball fields surrounding a rural school. School fields used to
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