英文關鍵字
alarm
axles
clock
counting
gear
gears
inside
interior
loaded
measurement
measurements
mechanical
mechanism
metal
modes
motion
movement
moving
old
operated
rotating
spring
springoperated
springs
the
ticking
timer
timing
wheels
work
yellow
英文關鍵字
alarm
axles
clock
counting
gear
gears
inside
interior
loaded
measurement
measurements
mechanical
mechanism
metal
modes
motion
movement
moving
old
operated
rotating
spring
springoperated
springs
the
ticking
timer
timing
wheels
work
yellow