purification
n.提純；凈化
purify
v.提純
例句：
1、Extraction,?separation?and?purification?techniques?of?tea?polysaccharides?were introduced.?And?its?development?trend?of?purification?technique?was?forecasted.
介紹了茶多糖提取、分離和純化技術,並展望了其提純技術的發展方向。
2、One?of?the?most?advantageous?and?widely?used?method?is?the?tandem?affinity? purification.
串聯親和純化是目前應用最廣泛、最具優勢的方法之壹。
refinement
n.提純；精制
1、Phase?III,?from?March?1991?to?March?1993,?focused?on?the?refinement?and? institutionalization?of?these?activities.
從1991年3月到1993年3月，第三階段的重點是對這些活動做精細的改進並且使其制度化。
2、The?new?plan?is?a?refinement?of?the?one?before.
新計劃比原計劃有改進。