VOA慢速英语:美国多个州推出新冠病毒警示APP

exposure – n. coming in contact with something

app – n. a mobile phone program that performs a special function

isolate – v. to separate from other people or things

frustrate – v. make someone feel annoyed or less confident

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

location – n. a place or position

notify – v. to tell someone officially about something

regional – adj. relating to or coming from a particular area