英文關鍵字
abstract
act
alert
art
background
ban
barring
business
clip
communication
design
drive
element
enactment
entrance
fly
hand
icon
image
indication
interdict
interdiction
isolated
law
legislation
mark
motion
move
movement
notification
penalty
prohibition
proscription
punishment
ride
safe
safety
security
segment
sentence
shape
sign
silhouette
skate
skateboard
statute
symbol
travel
warning