The various methods of purification through the use of selective adsorption have several features in common . 使用选择吸附的各种净化方法都有几个共同特征。
In order to maintain the catalyst at a high level of activity the feedstock must be carefully purified . 为保持催化剂的高度灵活性，必须对进料精心加以净化。
Most of oil in the u.s. is refined with caustic soda, soda ash or some combination of the two . 在美国，大多数豆油是用苛性苏打，苏打灰或二者的混合剂净化的。
The view has been taken by some that plants may in fact cleanse polluted air, even as they are being injured . 有些人认为，植物纵使被伤害，仍能净化污染了的空气。
Such acts of "clearing the air" are often more helpful to the clearer than to those who are starkly revealed . 这种“净化空气”的作法对清洁者经常比对那些彻底被揭露者更有利。
Sodium chloride and hydrochloric acid are often used to regenerate spent ion exchange resins used in water purification . 氯化钠和盐酸常用来再生水净化中用的废的离子交换树脂。
This sewage-consuming biological process depends on a closely interrelated succession of species of animal plankton . 这种污水的生物净化过程就依赖着浮游动物种类的一种密切相关的演替。
Liquid detergents, such as this one, can be placed in a pump type oil can and pumped to each tank top very easily . 液体净化剂，如所述的这种，可注入油灌式的泵中，便于抽入到每个槽内。
He looks well scrubbed and less bloated than usual, and made no reference to the events of two nights before . 他看上去经过了很好的“净化”处理，不象平时那样趾高气扬，也没有提到前两天晚上的事情。
When the wind comes from the mountains, it blows the smog out over the ocean, and the air in los angeles is reasonable clear . 当风从山地方向刮来时，它把烟雾吹到太平洋面上，洛杉矶的空气自然地得到了净化。
