By 2007, DuPont was saving $2.2bn a year through energy efficiency, the same as its total declared profits that year.

直至2007年，杜邦通过提高能源效率，每年能节省22亿美元，这与其当年公布的总利润相当。

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By 2007, DuPont was saving $2.2 billion a year through energy efficiency, the same as its total declared profits that year.

到2007年，杜邦公司通过提高能效一年节省22亿美元，和它那年公布的总利润一样多。

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