以下为句子列表：
英文: A pandemic can start when three conditions have been met: a new influenza virus subtype emerges; it infects humans, causing serious illness; and it spreads easily and sustainably among humans.
中文: 当以下三个条件具备时可出现全球爆发：出现一种新的病毒亚型，能够感染人并导致严重疾病，能够在人群中迅速持久传播。
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英文: A third advantage of static factory methods is that, unlike constructors, they can return an object of any subtype of their return type.
中文: 第三个好处是，与构造函数不同，它们可以返回一个原返回类型的子类型的对象。
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英文: Abstract: Volcanic-type uranium deposits in China are mainly located in southeastern China with the predominant mono-uranium subtype in ore composition.
中文: 文摘:中国火山岩型铀矿床主要产于东南沿海一带，其矿石物质成分以单铀类型为主，但也存在一些复杂类型的矿床。
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英文: “Subtype must be substitutable for their base types.
中文: 子类型必须能够替代他们的基本类型。
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英文: Comparative study on tryptophan and it to competing amino acid in CSF in Patients with different subtype of schizo phrenia
中文: 不同类型精神分裂症患者脑脊液色氨酸及其与竞争性氨基酸比值对照研究
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