英文關鍵字
armed
army
baltic
battle
battleship
blue
boat
building
city
cruiser
defense
flag
fleet
gun
harbor
holiday
marine
metal
military
missile
modern
nautical
navy
neva
parade
petersburg
protection
river
russia
russian
saint
sea
security
ship
sky
steel
strength
summer
technology
tourism
transport
transportation
travel
urban
vehicle
vessel
war
warship
water
weapon