正文

VOA慢速英语:马维拉成为第一个为儿童注射疟疾疫苗的国家

2019-04-26来源:和谐英语

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Words in This Story

immunize - v. to give (someone) a vaccine to prevent infection by a disease

mosquito - n. a small flying insect that bites the skin of people and animals and sucks their blood

moment - n. a very short period of time

dose - n. the amount of a medicine, drug, or vitamin that is taken at one time