VOA慢速英语:应该如何教授美国的种族奴隶历史

principle –n. a moral rule or belief that helps people know what is right and wrong, and that influences their actions

founding –n. the time when something is established or created for the future

exceptional –adj. unusually good : much better than average

advantages – n. something (such as a good position or condition) that helps to make someone or something better or more likely to succeed than others

survey- v. to ask (many people) a question or a series of questions in order to gather information about what most people do or think about something

intimidate- v. to make (someone) afraid

stain –n. something that causes people to have less respect for someone

alternative –adj. not usual or traditional

unique –adj. used to say that something or someone is unlike anything or anyone else

achievement –n. something that has been done or achieved through effort : a result of hard work