美國年底前要有4千萬無費疫苗，具體操作計劃
"We've learned much of the groundwork for these efforts and covered the major costs," he said. "We've paid for the vaccines. We've worked to ensure that [administrative] costs will be covered by private insurers and the federal government through Medicare, Medicaid and our program to cover COVID-19 costs for the uninsured."
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