慢速英语:贫穷国家面临疫苗的长期等待

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dose – n. the amount of a medicine or vaccine that is needed to be effective against disease

pharmaceutical – adj. related to the production and sale of drugs and medicines

option – n. one of two or more choices or possibilities

assurance – n. a strong statement that something will happen

global – adj. involving the whole world, worldwide

feasible – adj. possible, able to be done

equitable –adj. just, dealing fairly and equally with everybody

distribution – n. the act of delivering something to people