英文關鍵字
alcohol
background
black
blank
centimeter
clear
copy
design
education
equipment
graphic
horizontal
inch
instrument
isolated
length
light
line
measure
measurement
measuring
merchandise
meter
metric
nobody
number
object
office
old
one
retro
ruler
scale
school
space
standards
supplies
table
tape
tool
transparent
used
viewer
white
work
working