英文關鍵字
alarm
armed
army
battle
boat
carriage
caution
control
controlling
craft
dark
deep
defend
defending
defense
defensive
depth
engine
equipment
force
gauges
harbor
hardware
historic
historical
indicator
inside
knob
lamp
lever
light
mechanical
metal
military
movement
nautical
naval
ocean
old
periscope
russian
sailing
sea
ship
submarine
underwater
war
warfare
warship
wheel