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.
美国食品药品管理局(FDA)局长可能与唐纳德•特朗普(Donald Trump)在关于新冠病毒疫苗的推出时机上发生新的冲突。他坚称，该局的科学家将会坚守美国总统威胁要否决的一整套指引。
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