VOA慢速英语:航空公司难以说服公众乘坐飞机

mask – n. a protective covering for the face to designed prevent passage of infection from one person to another

bottom line – n. financial value of something

circulate – v. to move around or through something

bankruptcy – n. a legal proceeding for a person or a business that is unable to pay its debts

run its course – phr. to continue running naturally until finished

outbreak – n. a sudden start or increase in the spread of a disease or fighting

quarantine – n. the situation of being kept away from others to prevent a disease from spreading