The world’s largest oil and gas groups shed more than a billion barrels of reserves in 2014, the sharpest decline in at least six years, according to figures that show their exploration record has worsened as big discoveries dwindle.
数据显示，2014年世界最大油气集团的储量降低了逾10亿桶，为至少6年来的最大降幅。这些集团的勘探结果变糟，重大发现显著减少。
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