Marcellus shale

例句：

1. 1. The Marcellus shaleis a major source of natural gas inthe United States.
   马塞勒斯页岩是美国主要的天然气来源。
2. 2. The extraction of naturalgas from the Marcellus shalehas become a major industry in the region.
   从马塞勒斯页岩提取天然气已成为该地区的主要产业。
3. 3. Due to its highoil and gas content, the Marcellus shale is considered a valuable resourcefor drilling.
   由于其富含石油和天然气，马塞勒斯页岩被认为是一个宝贵的资源，用于钻探。