VOA慢速英语:航空公司的口罩政策鼓励更多的人出行

confidence - n. certainty

mask - n. a facial covering

customer - n. one who buys things from someone

pandemic - n. a contagious disease that spreads to other countries

scared - adj. being frightened

comfortable - adj. relaxed and easy

wipe - v. to wash or dust with a clothe

lobbying - adj. to represent and advocate for someone or something

filter - n. a device or a mass of material with tiny openings that cleans the air