VOA慢速英语:航空公司寻求对乘客进行新冠病毒快速检测

negative – adj. in a medical test, negative means the person being tested does not have a disease or condition

sample – n. a small amount of something that gives you information about the thing it was taken from

confidence – n. a feeling of being sure in one's ability to do something

positive – adj. in a medical test, positive means the person being tested has a disease or condition

quarantine – n. to keep (a person or animal) away from others to prevent a disease from spreading