Oil companies' profitability fell last year in spite of the sharp rise in oil prices, highlighting their vulnerability to a downturn, an authoritative industry study has found.
一項權威的行業調查發現,盡管油價大幅上漲,石油公司去年的盈利能力仍出現下降,這突顯了它們在面臨經濟衰退時的脆弱性。
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