VOA慢速英语:越南人用传统的放生鱼来庆祝农历新年

deed - n. something that is done: an act or action

contact tracing - n. the practice of identifying, notifying, and monitoring individuals who may have had close contact with a person having a confirmed or probable case of an infectious disease as a means of controlling the spread of infection

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

variant - n. different in some way from others of the same kind

attitude - n. the way you think and feel about someone or something