以下为句子列表：
英文: A small town, desperate to recover from hard economic times, is under threat when voracious Snakehead fish mutate and survive previous lake chemical poisonings.
中文: 一个为从经济危机中恢复而铤而走险的小镇，时下正处于在化学有毒物质污染的湖泊中幸存下来，突变的凶残的黑鱼威胁下。
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英文: So far, most bird flu cases in people have been caused through contact with infected poultry, but scientists are concerned the virus could mutate into a form more easily spread between humans, causing a pandemic.
中文: 迄今为止，大部分的人患禽流感病例都是由于接触了受感染的家禽引起，但专家担心病毒会变异成一种更易于在人类间传播的形式，从而在全世界引发大规模流感。
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英文: So far, most bird flu cases in people, have been caused through contact with infected poultry, but scientists are concernd the virus could mutate into a form more easily spread between humans cause a pandemic.
中文: 至今，大多数人群中的禽流感，是通过与感染的家禽接触而引起的，但是科学家们担心，病毒可能会变异成一种在人类中更容易传播的形式从而引发全国性的流行病。
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英文: The But scientists are concerned the virus could mutate into a far form more easily spread between humans causing a pandemic.
中文: 但是科学家更关注病毒会发生变异，更易在人类之间传播，从而变成全国性的。
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英文: The percentage of CD8 +T lymphocyte was obviously lower and the ratio of CD +/CD8 + was obviously higher in mutate group than wild strain group;
中文: 变异株组CD8+ T细胞百分率明显下降 ,CD+ /CD8+ 比值明显增高 ,CD + 、CD+ T细胞的百分率未见明显变化 ;
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