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intermedium
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媒介
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详细解释：
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以下为句子列表：
英文: The experimental results showed that when sodium methoxide were joined, the yield of methyl carbamate as a intermedium was clearly increased., and even made clearly that the reaction was divided into two steps.
中文: 实验表明，通过引入少量的甲醇钠，使中间产物氨基甲酸甲酯的产率有明显提高，进而表明尿素醇解是分两步进行的。
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