The US has committed to buy 100m doses of the Covid-19 vaccine being developed by Moderna, Donald Trump has announced, even while the vaccine remains in an experimental stage.
美國總統唐納•川普(Donald Trump)宣佈，美國承諾購買1億劑Moderna正在研發的新型冠狀病毒肺炎（COVID-19，即2019冠狀病毒病）疫苗，儘管該疫苗仍處於試驗階段。
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