Nigeria is Africa's leading oil producer but imports almost all its aviation fuel.

尼日利亚是非洲最大的石油生产国，但几乎所有的航空燃料都依赖进口。

That move followed a failed attempt to negotiate production restraints with Russia and other leading oil suppliers.

此前，沙特曾试图与俄罗斯和其他主要石油供应国就产量限制进行谈判，但以失败告终。

Leading oil producers tried to hammer out a deal.

【hammer】几大油厂试图商定一个协议。

An agreement in April among some of the world's leading oil exporters to reduce supply has been central to the recovery in prices in the last few weeks.

今年4月，全球一些主要石油出口国达成了减产协议，这是过去几周油价回升的关键因素。