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"
- A paving asphalt penetration ratio improver was introduced.
- Cyclohexyl nitrate is an effective cetane number improver for diesel oil.
His apprentices, improvers and the rest were atrociously lodged.出自： J. Fowles