英文關鍵字
alert
armed
army
boat
border
coast
coastguard
defend
defense
fast
fishery
fleet
force
grey
guard
gun
harbor
immigration
interception
marine
maritime
military
moving
nautical
naval
navy
ocean
patrol
patrolling
port
protection
radar
safety
sailing
sea
seascape
secure
security
ship
speed
transport
ukraine
vessel
warship
water
waves
weapon