rú / guǒ / gài / céng / chū / xiàn / liè / fèng / dì / xià / de / tiān / rán / qì / jiù / kě / néng / xiè / lòu如果盖层出现裂缝,地下的天然气就可能泄漏。If the cap rock develops cracks, the underground natural gas may leak out.