例句與造句

1. Biogas in commercial size existed in sedimentary basin which has high deposition velocity and low geothermal gradient and shale , coalbed or compacted sandstone in unconventional environments
   商業(yè)規(guī)模的生物氣存在于具有高沉積速率、低地溫梯度的沉積盆地中和非常規(guī)環(huán)境下形成的頁巖、煤層或致密砂巖中。
2. It's difficult to find compacted sandstone in a sentence. 用compacted sandstone造句挺難的