機器
adjustable
background
bolt
caucasian
child
childhood
children
construction
education
equipment
finger
gray
hand
handle
hardware
holding
improvement
infant
iron
isolated
kid
lesson
made
manual
material
mechanic
mechanical
metal
montessori
object
pin
play
preschool
pretty
repair
repairman
screw
screwdriver
silver
steel
tool
toy
white
wood
wooden
work
workshop
wrench
young