单词：alumina refractory
氧化铝耐火材料;矾土耐火材料
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发表于:2018-12-30 / 阅读(76) / 评论(0)
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单词解析速记
Down with Depressio 1. Everyone has a bad day once in a while. Problems at work, arguments with family members, or even changes in the weather can all bring us down and leave us feeling unhappy for a
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有声英文阅读
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双语有声阅读