英文關鍵字
valve
propane
fuel
gas
storage
safety
supply
tank
heating
hand
campground
fire
explosion
equipment
energy
dangerous
flammable
industrial
liquefied
petroleum
kitchen
steel
risk
refill
pressure
power
operating
opening
natural
man
lpg
lp
cylinder
compress
portable
handle
male
off
grid
open
camping
recreational
vehicle
full
rotate
set
up
source
spigot
turn
twist
bottle
clean
rv