英文關鍵字
antenna
battleship
broadcast
cellular
could
crane
dark
day
dock
energy
equipment
exploration
frequency
heavy
industry
machine
marine
mast
military
motion
museum
naval
navy
port
power
radar
radio
receiver
satellite
sea
ship
signal
silhouette
sky
station
steel
sunrise
sunset
tall
technology
telecommunication
tourists
tower
transmit
transmitter
transportation
vehicle
vessel
warship
water