英文關鍵字
bell
box
button
cable
cardboard
communication
communicative
connecting
control
door
doorbell
electronics
entrance
entry
entryphone
equipment
fiber
flat
floor
handset
home
house
identity
inter
intercom
interline
interphone
modern
open
optical
outdoors
packaging
pan
phone
pick
protection
push
ring
safety
security
speaker
system
technology
telecommunications
telecommunication
tile
urban
video
wire