英文關鍵字
pipeline
trailer
line
symbol
construction
installation
repair
engineering
welding
pipe
storage
tank
protection
system
broken
truck
layer
machine
excavator
tractor
prepare
space
crane
worker
researching
water
cleaning
technology
research
anticorrosion
work
contract
service
icon
motion
graphic
animation
pictogram
hd
animated
item
sign
black