VOA慢速英语:美国各州考虑采用科技手段强制留在家中

GPS – n. short for global position system, mapping based on the reception of signals from satellites in Earth's orbit

quarantine – n. a period in which people's movements are restricted because they might have been infected with disease

evaluate – v. to study or consider

pandemic – n. a disease spreading over a wide area and affecting large numbers of people

uncharted – v. unexplored or unknown