VOA慢速英语:美国抗议标志走进史密森学会

tribute –n. something that you say, give, or do to show respect or affection for someone

boarded-up –adj. related to covering or closing (something) with pieces of wood

medic –n. a person who does medical work

on site –adv. at the place where a business or activity happens

moment –n. a very short period of time

common denominator –n. something (such as a feature or quality) that is shared by all the members of a group of people or things

mural –n. a usually large painting that is done directly on the surface of a wall