rock tar

• n. 原油

例句

用作名词 (n.)

1. Naturally occurring rock oil is referred to as crude oil or petroleum.
   天然形成之石油，我们称作原油或石油。
2. As long as the price of crude oil continues to increase, the technology and money for tar sands mining will probably be found.
   只要原油的价格继续上涨，开采油砂的技术和投资是会有的。