英语听力精选进阶版 13600（在线收听）

Tracking crime on Twitter

Vocabulary

scanning

to search with a scanner

airwaves

e.g. radio programmes or phone conversations

police radio conversations

private police conversations on wireless devices

crime reporters

journalists that report on criminal activity

residents

people who live in an area or neighbourhood

monitor

to listen to

social networking site

a website used by many people to communicate e.g Facebook

Twitter followers

people who are interested in a person or topic on Twitter

reality

what is really happening

neighbourhood

a community in a town or city