improver
n. 改良者；改善者；改进剂
近义词：reformer，campaigner，activist，crusader，agitator，add-on，do-gooder，humanitarian，addition，
英英释义
Noun
- someone devoted to the promotion of human welfare and to social reforms
- a component that is added to something to improve it;
"the addition of a bathroom was a major improvement" "the addition of cinnamon improved the flavor"
例句
用作名词(n.)
- A paving asphalt penetration ratio improver was introduced.介绍了一种提高道路沥青针入度比的改进剂。
- Cyclohexyl nitrate is an effective cetane number improver for diesel oil.硝酸环己酯是一种有效的柴油十六烷值改进剂。