The number of transactions involving oil futures on the New York Mercantile Exchange (NYMEX), the biggest market for oil, has almost tripled since 2004.
2004年以来，最大的石油市场，纽约商品交易所的石油期货交易增长了两倍。
Oil and gas accounts for 90 percent of foreign exchange earnings in Nigeria, Africa's most populous nation with 140 million people.
石油和天然气占尼日利亚外汇收入的90%。尼日利亚有1亿4千万人口，是非洲人口最多的国家。
I first took a course in development economics in 1973, a year of economic turmoil with the Arab oil embargo and shortly after the downfall of the Bretton Woods exchange rate system.
我第一次学习发展经济学课程是在1973年，那一年由于阿拉伯国家的石油禁运导致经济动荡，而且布雷顿森林体系刚刚崩溃不久。
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