慢速英语:委内瑞拉为古巴购买原油

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sanction – n. a measure or action aimed at forcing a country to obey international rules or laws

generous – adj. unselfish; kind-hearted; liberal

barrel – n. a large container used as a form of measurement

isolation – n. the action of separating someone or something from other things

crude – adj. uNPRocessed; untreated