It includes data from over 50,000 oil, gas, and coal fields in 89 countries.

该数据库收集了89个国家5万多个油、天然气和煤田的数据。

Is it the world's largest coal field; the world's largest gold source or the world's largest diamond source?

a)有世界最大的煤矿？b)有着世界上最大的黄金矿？ c)有着世界上最大的钻矿？

A reminder of the diverse communities drawn to the  coal fields in search of work.

一个，示了被煤矿吸引来寻找工作的多元社区。

Legacy mills, sited in coal fields in America and Europe, might be replaced by plants next door to iron ore mines, fed their electricity by connectors to the local grid.

传统的炼钢厂， 位于美国和欧洲的煤矿区，可能会被建在铁矿山旁边的工厂所取代，这些工厂通过连接当地电网来获取电力。

But the Durham coal owners had a wider problem in that a lot of the best coal fields in Durham were quite well inland, in the area around Bishop Auckland.

但达勒姆的煤矿主们面临着一个更大的问题， 即达勒姆的许多优质煤田都位于内陆地区，就在主教艾尔沃思镇周边。