translation.en: But as we tried these extraordinary things, as people went to this trouble to try and rework their tactics, we went back to the vaccine -- it's a 50-year-old vaccine -- and we thought, surely we can make a better vaccine, so that when they finally get to these kids, we can have a better bang for our buck.
translation.zh: 在我们尝试这些独特的方式 当人们费劲心思 重新制定战略的同时 我们再度回到疫苗本身，这疫苗已有50年历史 我们确信，我们能够研制出更好的疫苗 因此当儿童最终接收到疫苗时 我们会取得更好的预防效果