英文關鍵字
soap
factory
chemical
industry
cold
process
hot
purification
glycerin
removal
dyes
perfumes
refining
deodorization
reaction
chamber
crude
temperature
pressure
mixer
reactor
valves
boiler
healthcare
fluid
abstract
closeup
dirty
chambers
architecture
background
pipes
industrial
tanks
machinery
modern
technology
production
pattern
old
documentary
bangalore
india
saponification
manufacture
indoors
isolated
heavy
danger
business
empty