Experts believe Europe might have trillions of cubic meters of shale gas. Shale is a kind of rock.

专家认为欧洲可能有数万亿平方米的页岩气，页岩是一种岩石。

She says the presence of large shale gas reserves and political problems in Ukraine have increased interest in Europe's shale gas.

她说大量页岩气储备的存在和乌克兰的政治问题，使得人们对欧洲的页岩气越发感兴趣。