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: Furthermore, this decline was attributed to a reduction in the bilateral subtype of CP.
中文: 而且这种下降是由双侧痉挛性脑瘫发病率减少导致的。
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英文: H5N1 is a particular subtype of the avian influenza A virus, and is the current cause of bird flu in a number of countries.
中文: H5N1是禽流感A型病毒的一个特殊亚种，目前是许多国家禽流感的元凶。
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