In 2000, the World Health Organization (WHO) announced that China was already a polio-free country.
2000年,世界卫生组织(WHO)宣布中国已成为一个没有脊髓灰质炎的国家。
The risk of importations into polio-free areas remains as long as polio exists anywhere in the world.
只要全世界任何地方存在脊髓灰质炎,输入到无脊髓灰质炎地区的危险则继续存在。
Its main task is to monitor the polio-free status of the region.
其主要任务是监测该区域的无脊髓灰质炎状况。
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