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。

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。