英文關鍵字
african
angolan
black
boat
communication
computer
control
correct
coverall
earplugs
earprotection
ecr
electronic
engine
engineer
equipment
indoor
industry
machine
machinery
marine
mariner
maritime
mechanic
mechanism
motor
nigerian
occupation
occupied
one
person
profession
professional
radio
safety
serviceman
ship
shipping
technician
uhf
uniform
vessel
vhf
work
worker
working
workshop