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Mulva's expanding shale operations, too, having added about 90,000 acres in North America last year. — p.n.. Mulva还计划扩大油页岩项目，去年已经在北美圈地90,000英亩。 - 2
Mulva's expanding shale operations, too, having added about 90, 000 acres in North America last year. --P.N. Mulva还计划扩大油页岩项目，去年已经在北美圈地90 000英亩。
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