慢速英语:德国启用新冠病毒接触追踪

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trace – v. to find the origin of something

app – n. a program for a smartphone or other device that performs a special function

data - n. information or facts about something

transmitting – adj. used for sending out signals for radio, television, or mobile phones

location – n. a place or position

encrypt – v. to change electronic information into a secret system of letters, numbers of symbols

watchdog – n. an organization whose job is to make sure that companies and governments behave legally and provide good services