英文關鍵字
abstract
alert
area
arif
attention
background
biohazard
biology
black
caution
chemical
contamination
control
cool
danger
drawing
element
flat
forbidden
front
graphic
hazard
hazardous
icon
infection
infectious
inoace
isolated
material
modern
object
prohibition
protection
quarantine
rounded
security
set
sign
silhouette
style
symbol
toxic
trendy
vector
warn
warning
waste
zone