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1.The study found that the immunity level of the population had increased significantly.
研究发现，人群的免疫力水平显著提高。
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2. The new vaccine has been shown to significantly improve immunity levels in children.
新疫苗已被证明能显著提高儿童的免疫力水平。
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3. The government is working on a plan to increase public awareness and improve immunity levels.
政府正在制定计划以提高公众意识并改善免疫力水平。