单词：mercury vapor arc rectifier
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Several years ago, Iris Arc Crystal, a company I co-founded with Francesca Patruno, experienced a 1)lull in business. We had recently hired several new employees and hoped that the 2)slowdown was only
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Toxin-loving Trees 树木能调节气候,保持生态平衡，树木通过光合作用，吸进二氧化碳,吐出氧气,使空气清洁，新鲜。一亩树林放出的氧气够65人呼吸一辈子。树还能防风固沙，涵养水土,吸收各种粉
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