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So, it was something that parents before 1950 were very concerned about.
所以,在一九五零年之前,脊髓灰质炎是父母们十分担心的一种疾病
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So, it was something that parents before 1950 were very concerned about.
所以,在一九五零年之前,脊髓灰质炎是父母们十分担心的一种疾病
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