shale tar pitch

例句：

1. 1. The shale oil is a newtype of energy source that has great potential.
   页岩油是一种具有巨大潜力的新型能源。
2. 2. The shale oil is extracted fromshale rock and can be used asfuel.
   页岩油是从页岩岩石中提取出来的，可以作为燃料使用。
3. 3.The shale oil is a kind ofoil that is difficult to refine and haslow quality.
   页岩油是一种难以精炼且质量较低的油。