马丁·路德·金在美国普及了和平抗议

boycott – n. to refuse to buy, use, or participate in something as a way of protesting

indignation – n. anger caused by something that is unfair or wrong

spokesman – n. someone who speaks for or represents a person, company, etc.

courteous – adj. very polite in a way that shows respect

segregation – n. the practice or policy of keeping people of different races, religions, etc., separate from each other