单词:diamond core bit
金刚石取心钻头
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By Jerilyn Watson ENVIRONMENT REPORT -July 19, 2002: Yucca Mountain This is the VOA Special English Environment Report. Last week, the United States Senate gave final congressional approval for a proj
发表于:2019-01-30 / 阅读(59) / 评论(0)
健康与环境