英文關鍵字
padlock
key
lock
shield
insurance
assurance
online
internet
technology
safety
security
protection
guard
data
encryption
access
password
icon
sign
symbol
concept
idea
business
industry
digital
privacy
communication
connection
network
mouse
wireless
computer
table
top
desk
desktop
wooden
road
street
traffic
jam
rush
hour
crowded
busy
city
urban
night
outdoor
exterior
copy
space
empty
blank