英文關鍵字
adjustable
adult
and
cell
check
checked
checking
coffee
crossing
day
documentation
electrical
employee
enclosure
fix
gloves
hard
hat
helmet
industry
man
men
near
occupation
one
people
phone
picture
production
professional
protection
railroad
railway
relays
road
safety
sign
signal
site
skill
smart
smartphones
tablet
take
talking
the
transport
try
uniform
using
vest
walking
winter
with
work
worker
wrench