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