英文關鍵字
antiterrorism
attack
concept
connection
conversations
crime
cyber
cybersecurity
data
detective
digital
electronic
espionage
government
headphones
information
intelligence
internet
law
listening
lock
man
military
monitoring
network
personal
police
policeman
privacy
private
protection
putting
recorder
recording
safety
secret
secure
security
sound
spy
spying
suspicious
system
tapping
technology
telephone
unsafe
warfare
wiretap
wiretapping