英语翻译In the U.S.,cases of polio are now extremely rare,and ironically,are almost always caused by the Sabin vaccine itself - being live,the virus can mutate to a stronger form.Elsewhere there are still about 250,000 cases per year,mostly in de

英语翻译In the U.S.,cases of polio are now extremely rare,and ironically,are almost always caused by the Sabin vaccine itself - being live,the virus can mutate to a stronger form.Elsewhere there are still about 250,000 cases per year,mostly in de
英语翻译
In the U.S.,cases of polio are now extremely rare,and ironically,are almost always caused by the Sabin vaccine itself - being live,the virus can mutate to a stronger form.Elsewhere there are still about 250,000 cases per year,mostly in developing nations where vaccination has not become widespread.The World Health Organization has goals to eradicate polio completely in the first decade of the twenty-first century.
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英语翻译In the U.S.,cases of polio are now extremely rare,and ironically,are almost always caused by the Sabin vaccine itself - being live,the virus can mutate to a stronger form.Elsewhere there are still about 250,000 cases per year,mostly in de
在美国,小儿麻痹症已几乎绝迹,然而具有讽刺意味的是,这种症状却经常是由沙宾疫苗本身引起的 - （疫苗中）活着的病毒能够变异成为更强的形态.
在其他地方,尤其是在疫苗尚未普及的发展中国家,每年仍然有25万例小儿麻痹症.世界卫生组织的目标是在21世纪的第一个10年内彻底根除小儿麻痹症.

在美国，现在的小儿麻痹症病例十分罕见，讽刺的是，这些病例都是由sabin疫苗本身造成的-为了存活，病毒变异成了更强的种类。

In the U.S., cases of polio are now extremely rare, and ironically, are almost always caused by the Sabin vaccine itself - being live, the virus can mutate to a stronger form. Elsewhere there are stil...

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In the U.S., cases of polio are now extremely rare, and ironically, are almost always caused by the Sabin vaccine itself - being live, the virus can mutate to a stronger form. Elsewhere there are still about 250,000 cases per year, mostly in developing nations where vaccination has not become widespread. The World Health Organization has goals to eradicate polio completely in the first decade of the twenty-first century.
在美国，小儿麻痹症病例目前极为罕见，具有讽刺意味的，几乎都是由沙宾疫苗本身-活而引起，该病毒可以发生变异，一个更强大的形式。其它地方还有约25万每年的案件，主要是在发展中国家，接种疫苗并没有变得普遍。世界卫生组织的目标，消除了21头十年脊髓灰质炎完全世纪。

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在美国，脊髓灰质炎（小儿麻痹症）已经极其少见。然而，具有讽刺意味的是，在这里发生的病例几乎都是由脊髓灰质炎活疫苗自身引起的：由于病毒在存活期间可能发生强化的变异。
在世界上的其他地方，每年仍然有25万脊髓灰质炎的病例发生，大多数是在发展中国家；在那里疫苗的接种仍不够普及。世界卫生组织所定的目标是，在21世纪的第一个十年内彻底消灭脊髓灰质炎。...

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在美国，脊髓灰质炎（小儿麻痹症）已经极其少见。然而，具有讽刺意味的是，在这里发生的病例几乎都是由脊髓灰质炎活疫苗自身引起的：由于病毒在存活期间可能发生强化的变异。
在世界上的其他地方，每年仍然有25万脊髓灰质炎的病例发生，大多数是在发展中国家；在那里疫苗的接种仍不够普及。世界卫生组织所定的目标是，在21世纪的第一个十年内彻底消灭脊髓灰质炎。

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