gas occurrence

• 瓦斯赋存

gas occurrence的用法和样例：

例句

1. The gas occurrence rule is the techno-basement of the study on the gas emission rule and gas harm harness.
   煤层瓦斯赋存状态是研究矿井瓦斯涌出规律和瓦斯灾害防治的技术基础。