今日油价（9月21日）：原油连续第四日下跌，跌破102美元。触发下跌的原因是什么？
· economictimes.indiatimes.com
布伦特原油期货下跌2.16美元，跌幅2.1%，至每桶101.70美元，此前上周五收跌0.91%。美国西德克萨斯中质原油下跌2.09美元，跌幅2.10%，至每桶98.20美元，延续前一交易日1.58%的跌幅。
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