VOA慢速英语:对某些疫苗的不信任可以追溯到实验研究

resident – n. living in a place for some length of time

transmit – v. to cause a virus, disease, etc. to be given to others

unethical – adj. morally bad : not ethical

suspicious – adj. having or showing a feeling that something is wrong or that someone is behaving wrongly : feeling or showing suspicion

impact – n. a powerful or major influence or effect

rush – v. to move forward or progress without preparation

persuade – v. to cause (someone) to do something by asking, arguing, or giving reasons

factor – n. something that helps produce or influence a result : one of the things that cause something to happen

shameful – adj. very bad : bad enough to make someone ashamed

blemish – n. a fact or event that causes people to respect someone or something less