英文關鍵字
elevator
background
modern
digital
office
electric
electronic
element
equipment
indicator
led
level
light
panel
end
diode
design
number
digit
technology
device
deadline
business
counter
countdown
change
red
screen
top
remaining
numeral
effect
second
sign
passage
down
lift
concept
transportation
construction
time
text
display
textured
set
power
black