英文關鍵字
adheres
assembly
building
burden
capacity
city
closeup
construction
crane
dig
digger
excavation
fix
forklift
ground
heating
heavy
hoist
industrial
installation
job
labor
leverage
load
lowering
machines
man
mechanical
mounting
people
pipeline
pipes
piping
power
process
put
ropes
system
tap
technology
trench
trenching
water
work
workers