土地覆盖和土地覆盖的自然变更，在地球系统的气候和生物化学全球尺度模式中扮演着重要角色，对全球生态环境产生着巨大的影响。
Land cover and its natural alteration, which play an important role in climate system and biochemistry pattern in globe scale, have brought tremendous effect to global entironment.
在现阶段，跨国粮商已经做到了全球化经营、全环节利润、全市场覆盖的运作模式。
At present, transnational grain dealers have done a global business, all part of the profit, total market coverage of the operation.
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