英文關鍵字
3d
address
air
airmail
background
blank
card
chromakey
clean
communication
correspondence
design
detail
document
edge
envelope
frame
front
green
icon
isolated
isometric
label
letter
mailing
message
new
note
object
open
paper
place
post
postage
postbox
postcard
postmark
screen
sealed
send
sign
stamp
sticker
striped
symbol
template
travel
underline
white