a city gas supplement A supplementary agent is a substance that is added to a substance and causes it to smell. The gas itself doesn't smell.
If the gas leaks and doesn't smell, it's hard to find it.....
A city gas supplement에 대한 요약내용입니다.
자세한 내용은 아래에 원문링크를 확인해주시기 바랍니다.