英文關鍵字
aged
build
cable
cargo
construction
crab
crane
engineering
equipment
gear
gig
heavy
high
hoist
industrial
industry
iron
lift
lifting
load
machine
machinery
mechanic
mechanical
mechanism
metal
mining
old
operate
operation
prop
pulley
rolling
rope
run
rust
spindle
steel
string
system
tool
tow
transport
transportation
vehicle
weight
wheel
winch
work