translation.en: And it happened so fast in the United States, however, that even just last month Jon Stewart said this:  Jon Stewart: Where is polio still active?
translation.zh: 虽然在美国，情况迅速好转，但是 甚至就在上个月，乔恩·斯图尔特问我 乔恩·斯图尔特：脊髓灰质炎还活跃在哪些地方呢？