文献检索，用中文搜 PubMed

If a covid-19 vaccine is finally developed, tough decisions await about who should be first in line for the limited initial supply, says .

[具体说话者未给出]表示，如果最终研发出新冠疫苗，关于谁应该排在优先接种有限初始供应疫苗的首位，将面临艰难抉择。

If a covid-19 vaccine is finally developed, tough decisions await about who should be first in line for the limited initial supply, says .