Oil prices face further upward pressure as they near $80 a barrel because of heavy trading in options contracts ahead of the year end, brokers and analysts said.
經紀商和分析師表示,石油價格逼近每桶80美元,並面臨進一步上漲的壓力,因爲在年底前到期的大量期權合約的行權價格集中在這一位置。
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