reformer
🇺🇸
/rɪˈfɔːrmər/
🇬🇧
/rɪˈfɔːmə(r)/
Someone who tries to change and improve something, like laws or habits, to make them better.
The reformer worked hard to change the laws to make society better.
改革者努力改变法律,使社会变得更好。