機器
appliances
arc
association
blade
cell
centrifuge
cleaning
cleanliness
closeup
compound
convenient
dense
design
detail
diameter
drum
element
fantastic
fastenings
gap
hexagon
honeycomb
household
inner
iron
mechanism
metallic
modern
practical
prevention
rotation
round
row
safe
scales
segment
shell
shiny
space
stainless
steel
washing