Once its impurities had settled, the oil could be graded...一旦杂质沉淀下去，油就可以分级了。The separation and determination of the primary impurities of diflubenzuron by liquid chromatography were carried out.通过反相液相色谱方法往甲醇与水的混合流动相中加入适当...
Once its impurities had settled, the oil could be graded.一旦杂质沉淀下去，油就可以分级了。A filter will remove most impurities found in water.过滤器会滤掉水中的大部分杂质。Oil is refined to remove naturally occurring impurities.油经过提炼去除天然存在的杂质。...
Company executives say revamped merchandising should help Macy's earnings to grow.公司主管说销售规划改进后应该能够帮助梅西公司提高收益。Ricardo Bofill, the Catalan architect, has designed the revamped airport.里卡多·博菲利是一名加泰罗尼亚的建筑师，这座整修过的机场就是他设计...