... productive well 生产井 productive zone 生产层 productive 生产的；开采的 ...
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questionable productive zone 可疑生产层
main productive zone 主力生产层
openhole productive zone 裸眼生产层段
·2,447,543篇论文数据，部分数据来源于NoteExpress
It accounts for one percent or so of Euro-zone gross domestic product and its labor force is one of the least productive on the continent.
FORBES: What Is Going To Happen To Europe?
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