周六是举行大型活动的日子，在稍微偏南方的上海举办如此规模的活动比在首都安全些。
The big event was Saturday and was the reason most abandoned the Capital for a little bit of the southern custom.
先前举行的类似大型活动在该区域几乎所有国家阻断了脊髓灰质炎的传播。
Similar mass campaigns previously stopped polio in nearly all countries across the region.
类似大型活动将于5月25日在阿根廷、7月20日在哥伦比亚，以及9月18日在智利举行。
Similar events will take place in Argentina on May 25th, in Colombia on July 20th and in Chile on September 18th.
类似大型活动将于5月25日在阿根廷、7月20日在哥伦比亚，以及9月18日在智利举行。
Similar events will take place in Argentina on May 25th, in Colombia on July 20th and in Chile on September 18th.
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