英文關鍵字
crane
steel
equipment
over
overhead
production
factory
manufacturing
hall
industry
technology
tons
warehouse
metal
transportation
lift
iron
industrial
inside
weight
construction
hook
beam
heavy
hoist
machinery
gantry
indoor
plant
carry
tool
load
strong
old
wire
workshop
manufacture
engineering
hang
rope
modern
machine
transport
line
robotic
power