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\nIn the study, mice were given a drop of the vaccine in their noses. Some recieved multiple doses, given a week apart. Each mouse was then exposed to one type of respiratory virus. With three doses of the vaccine, mice were protected against SARS-CoV-2 and other coronaviruses for at least three months.，详情可参考pg电子官网
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auto features_gpu = features.gpu();。超级权重对此有专业解读