上半年,国际油价涨快跌慢,外需经济持续下行,各大炼厂通过优化资源、紧跟市场、降本压费等各项措施,有效地增加了效益,降低了成本。 In the first half of the year, the international oil prices went up and down slowly and the external demand economy continued to downturn. All the major refineries effectively increased their benefits and reduced their costs by optimizing resources, keeping abreast of the market and lowering cost pressures.