ameliorator

例句：

1. 1. The new policy aims to ameliorate the economic downturn.
   新政策旨在缓解经济衰退。
2. 2. The research team is committed to ameliorating the health of the population.
   研究团队致力于提高人口健康水平。
3. 3. The government has implemented several measures to ameliorate the environmental impacts of industrialization.
   政府已经采取了若干措施来减轻工业化对环境的影响。