复数： coalfields

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First , some may depend on natural resources , such as a coalfield or a harbour .

第一，有些企业是因为对自然资源的依赖性，比如煤田或者港口。

Yulin city shenfu coalfield leading group office .

榆林市神府煤田开发领导小组办公室。

The affinity of associated elements in permian coals from the huaibei coalfield .

淮北煤田二叠纪煤中伴生元素的亲和性研究。

Yulin prefecture shenfu coalfield industry and trade corporation , the installation company .

榆林地区神府煤田工贸总公司安装公司。

However , international mining executives have expressed deep frustration at slow progress in setting the terms of foreign involvement in projects such as oyu tolgoi and the tavan tolgoi coalfield .

然而，对于外资参与奥尤陶勒盖铜矿和塔班陶勒盖（tavantolgoi）煤田等项目，相关条款的订立进展缓慢，多名国际矿业集团主管表示深感受挫。