The head of the US Food and Drug Administration has risked sparking a fresh conflict with Donald Trump over the timing of a coronavirus vaccine, after insisting his scientists would stick to a set of guidelines that the US president has threatened to overrule.
美國食品藥品管理局(FDA)局長可能與唐納德?特朗普(Donald Trump)在關于新冠病毒疫苗的推出時機上發生新的沖突。他堅稱，該局的科學家將會堅守美國總統威脅要否決的一整套指引。
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