英文關鍵字
assembly
automobile
background
closeup
convenience
crosscutting
device
disassembly
drive
effort
employee
engineering
factory
heavy
holes
indoors
industry
job
machine
machinery
manual
manufacture
manufacturing
mechanical
motion
moves
overhaul
overturn
plant
protection
reducer
repairs
rotate
service
shop
smoothly
stand
technology
transportation
turn
twist
uniform
workshop