That was how vaccination was discovered.
这就是发现接种牛痘的情况。
Once the first doses of pandemic influenza a (H1N1) vaccine become available, national health authorities will decide how to implement national vaccination campaigns.
一旦第一剂大流行甲型流感(H1N1)疫苗到位，国家卫生机构就要决定怎样去实施国家疫苗接种活动。
UNICEF relied too much on asking youngsters how they felt (did they have "kind and helpful" schoolmates?); the new study stresses meatier things like vaccination and test scores.
联合国儿童基金会过于依赖于询问儿童的感受(他们曾经有有好和乐于助人的同学吗？)；而这份新的报告强调更加值得研究的问题，比如接种疫苗和考试分数。
This photo story shows how the polio vaccination campaign was organized in remote regions of Afghanistan and Pakistan and along the porous border between the two countries.
这一照片故事显示在阿富汗和巴基斯坦偏远地区以及在两国之间可渗透边境一带开展脊髓灰质炎预防接种运动的情况。
Please show your vaccination certificate at the counter over there later. How long will you stay in the US?
请呆会儿把你的种痘证书给那边柜台的人看。你将在美国待多久？
Please show your vaccination certificate at the counter over there later. How long will you stay in the US?
请呆会儿把你的种痘证书给那边柜台的人看。你将在美国待多久？
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