英文關鍵字
bag
balloon
belarus
bomb
bottle
bulb
butadiene
butane
butylene
common
container
countryside
cylinder
danger
domestic
energy
everyday
extinguishers
factory
fuel
gas
gasoline
heat
hose
industrial
iron
isobutylene
liquefied
natural
old
petroleum
portable
pressure
propane
propylene
refining
safety
scattered
steel
stove
tank
technology
torche
valve
vessel
vintage