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collimation
magnifying lens
telephoto lens
camera lens
lens extender
helios 44m
photo lens
lens cracking
teleconverter
zoom lens
tripod ball head
eyepieces
valve cap
macro extension tubes
aperture
mf lens
fish eye
lens reflection
v838 monocerotis
zenit camera
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图片
GIF 动图
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turbo jet engine
nozzle
bike black background
bike lamp
jet engine
bicycle bell
wheel hub
pressurized water pipe
mercedes engine
bmw engine
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bushings
anodizing
spinning top
potentiometers
square tubing
triode
flywheels
locksmithing
potentiometer
spiral bevel gears
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aluminum tube
rechargeable battery
supercapacitor
a flashlight
supercapacitors
pencil battery
rechargeable batteries
co2 cylinders
square steel tube
passivation
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bike lamp
derailleur
derailleurs
faucet
water faucet
mixer tap
bicycle bell
chainrings
mirror in a drop
kinetic art
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gel capsules
handbell
care capsules
microcapsules
anodizing
electroplated
photomultipliers
laryngoscope
electroplating
handbells
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wooden spool
rifling
grinding wheel
downhole
bushings
cable reel
bottle cap
drainage pipes
water pipes
wooden cable reel
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ambisonics
horn loudspeaker
digital bi-amp powered loudspeaker
loudspeakers
loudspeaker
electric megaphone
stereophile
bass speaker
beautiful speaker
srl camera
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telephoto lens
photo lens
lens extender
magnifying lens
ophthalmoscope
camera lens
monocular
isight
zoom lens
telescoping
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the tonearm
micrometer
microtome
micrometers
gear lever
the nozzle needle
interferometer
sewing machine
cinematograph
microfilming
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syphon
galvanometer
tripod head
ambisonics
oil lamp
variometer
mutoscope
tripod ball head
fragrance teapot
valve cap
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magnifying lens
twin-lens reflex
camera lens
lens cracking
photometers
photo lens
twin lens reflex
slr camera
autofocus
full frame camera
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valve cap
countersink
lugnuts
two pin plug
piston valve
bushings
insulator
inductor
antepenultimate
abutments
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centrifugal
water droplet
dolphin background
mirror in a drop
vortex
waterdrop
drop of water
a drop of water
water drop
scroll wallpaper
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fluoroscopic
autoclave
fresnel
keratoplasty
tokamak
collimation
turbomachinery
mutoscope
autoclaves
robot eye
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stylus
cosmetic brush
black pencils
pencil icon
pen nib
blackwing
beautiful pencil
mechanical pencil
livescribe
drill bit
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valve cap
countersink
pencil sharpener
insulator
lugnuts
piston valve
handloading
roofing nails
darning needle
bell button
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abloy
colorimeter
grundfos
srl camera
minidv
site camera gun
tripod ball head
paxina camera
camcorder
video camera
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locket
bottle cap
valve cap
pocket watch
magnetic compass
bell button
circular ring
wristwatch
loupe
watchmaking
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micrometer
rifling
crankshafts
the tonearm
a pistol shaped gland
pommel
camshaft
crankshaft
piston valve
brake mechanism
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candle holder with handle
spinning top
wooden spinning top
bell button
taijitu
valve cap
cocktail shaker
tea light holder
cosmetic oil
singing bowl massage