哥伦比亚小镇无人感染新冠病毒:我们仍需警惕

mask – n. a covering for the face, especially used to cover the nose and mouth to prevent the spread of disease

density – adj. the amount of something in a defined area

bill –n. paper money

county –n. an area of a state or country this is larger than a city and has its own local government

miracle – n. a wonderful event

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

symptom – n. a sign or effect that shows disease is present

jungle – n. a thick forest in areas near the Equator of the Earth