At the surface, everything cooled really quickly to make these igneous rock formations called kimberlites, with diamonds hiding inside.

在地表，岩浆迅速冷却并形成名为金伯利岩的火成岩，钻石就藏匿其中。

The Lucapa company searches for underground rock formations called " kimberlite pipes."

卢卡帕钻石公司寻找被称为“金伯利岩管道”的地下岩层。

The Lucapa company searches for underground rock formations called " kimberlite pipes." This is known to be a main source of diamonds, said Wetherall.

卢卡帕公司在搜寻被称为“金伯利岩管”的地下岩层。韦瑟尔说，众所周知，这是钻石的主要来源。