Some propose storing the CO2 in coal mines or liquid storage in the ocean, Shell favors storing CO2 in deep geological structures such as saline(盐的) formations and exhausted oil and gas fields that exist throughout the world.
出自-2012年6月阅读原文
By explaining some essential geological principles.
出自-2010年6月听力原文
As he prepared the speech, Juan kept asking himself, "How can I make this clear and meaningful to someone who knows nothing about earthquakes or geological principles
出自-2010年6月听力原文