詞匯

1.???????????????contact?聯(lián)系，接觸?????????

2.???????????????positive?積極的

3.???????????????notify?通知，通告

4.???????????????alert?向…發(fā)出警報(bào)

5.???????????????infected?被感染的

6.???????????????prior?先前的

Apple and Google build smartphone tool to track COVID-19

Tech giants Apple and Google are teaming up to create a system that would let smartphone users know when they've come into contact with someone who has COVID-19.

The technology would rely on the Bluetooth signals that smartphones can both send out and receive. If a person tests positive for COVID-19, they could notify public health authorities through an app. Those public health apps would then alert anyone whose smartphones had come near the infected person's phone in the prior 14 days.