More than half of U.S. adults have received at least one COVID-19 vaccination. If enough people get vaccinated, the U.S. could obtain herd immunity later this year, which would significantly stop the spread of COVID-19.

超過半數美國成年人至少都已經接種過一劑COVID-19疫苗。如果能有足夠人數接種疫苗，則美國可望將能於今年稍晚達到群體免疫，繼而大大遏阻COVID-19的傳播。

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