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。...
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...
特拉斯科特说话啰唆，让人很难分清哪是纯粹的事实哪是添油加醋的修饰之辞。Truscott's verbosity made it hard to separate plain fact from decorative embellishment.分清良莠并不总是很容易。It isn't always easy to separate the wheat from the chaff.你首先得分清敌友.You'...
On board were enough provisions for two weeks.船上有足够两周吃的食物。Provisions may be purchased from the mini-market.或许能在小型超市里买到日常用品。The campers got their provisions at the village shop.野营者在乡村商店买食物....