Marker crude; benchmark crude [oil] Saudi Arabian light crude oil (gravity API 34 degrees) employed as the standard on which OPEC price changes have been based.是什么意思_Marker crude; benchmark crude [oil] Saudi Arabian light crude oil (gravity API 34 degrees) employed as the standard on which OPEC price changes have been based.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句