英文關鍵字
adjusting
amp
amplifier
appliance
audio
background
begin
beginning
black
blinking
blue
blues
booting
cable
closeup
concert
connection
device
distortion
down
electric
electrical
electro
electronics
energy
equipment
gold
jack
jazz
led
level
light
loud
panel
power
powered
sound
speaker
standby
start
studio
switch
symbol
technology
turned
volume