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And so they're already very safe, very effective vaccines available for many infectious diseases.
所以这些疫苗非常安全有效,常备用来对付各种传染病
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- 来自原声例句
And so they're already very safe, very effective vaccines available for many infectious diseases.
所以这些疫苗非常安全有效,常备用来对付各种传染病
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