shale

We must find economical methods for extracting oil from shale.

我们必须找到从页岩中采油的经济方法。

The North American shale gas boom has resulted in record low prices there.

北美页岩气的繁荣导致那里的价格创新低。

The Burgess Shale formation also has fossils of many extinct representatives of modern animal groups.

伯吉斯页岩地层中也有许多代表着现代动物群中已经灭绝的物种的化石。

Fossil formations like the Burgess Shale show that evolution cannot always be thought of as a slow progression.

像波基斯页岩这样的化石层表明进化不应该总被看作是一个缓慢的过程。

The shale was deposited in an oxygen-deficient lake where lethal gases sometimes bubbled up and killed animals.

页岩沉积在一个缺氧的湖泊里，那里有时会冒出致命的气体，杀死动物。