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1. The new drug is an ameliorative agent for treating chronic diseases.
这种新药是治疗慢性疾病的改良剂。
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2. The researcher is an ameliorative scientist who has made significant contributions to the field.
这位研究员是一位在领域内做出重大贡献的改良科学家。
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3. The ameliorative measures taken by the government have significantly improved the quality of life for the citizens.
政府采取的改良措施已经显著提高了市民的生活质量。