英文關鍵字
americana
antique
basement
boat
boiler
captain
cargo
coal
cruise
cylinder
cylinders
diesel
emergency
engine
engineer
equipment
float
fuel
gear
green
health
industrial
industry
journey
machine
machinery
main
maintenance
marine
maritime
metal
motor
nautical
pipe
piston
platform
power
propulsion
railing
room
safe
safety
ship
swim
transport
transportation
travel
unmanned
vessel
water