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And though most scientists hail vaccines as one of public health’s greatest achievements, they have provoked fear, distrust, and contentious resistance since Edward Jenner invented the first vaccine, to prevent smallpox, in the late 1700s.，推荐阅读同城约会获取更多信息
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Chelsea must keep their heads at Arsenal, Anthony Gordon faces his old club and a key return for Sunderland。旺商聊官方下载对此有专业解读