At the same time, however, the group singled out ongoing polio transmission in Nigeria as the single greatest risk to a polio-free world.
然而，与此同时，该小组突出尼日利亚脊髓灰质炎持续传播为对无脊髓灰质炎世界的单一最大危险。
At the same time, however, the group singled out ongoing polio transmission in Nigeria as the single greatest risk to a polio-free world.
然而，与此同时，该小组突出尼日利亚脊髓灰质炎持续传播为对无脊髓灰质炎世界的单一最大危险。
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