Polio, although it is eradicated in the United States, it continues elsewhere and is able to be brought into the country by visitors.
Polio, although it is eradicated in the United States, it continues elsewhere and is able to be
Polio, although eradicated in the United States, it still continues elsewhere and can be
Although still continuing elsewhere, polio has been eradicated in the United States and could be
Although having been eradicated in the United States, polio still continues elsewhere and is capable of being
Although eradicated in the United States, polio continues elsewhere and could be
is capable of being不简洁,好像在说POLIO自己能够被带走,不如D,POLIO可以被带走来的简洁;另外having been,好像在说polio被清过很多次,但是每次又重新回啦,然后再被清,意思不对;
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