英文關鍵字
accident
close
closing
discharge
drainage
equipment
flow
hands
male
nobody
occupation
open
opening
outdoors
pipe
plumbing
pressure
running
stream
valve
water
working
英文關鍵字
accident
close
closing
discharge
drainage
equipment
flow
hands
male
nobody
occupation
open
opening
outdoors
pipe
plumbing
pressure
running
stream
valve
water
working