US imports of crude oil from Opec nations are at their lowest level in almost 30 years, underlining the impact of the shale revolution on global trade flows.
美國(guó)從石油輸出國(guó)組織(OPEC)進(jìn)口的原油量跌至近30年以來最低水平,突顯頁巖革命對(duì)全球貿(mào)易格局的影響。
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