The US already had the highest maternal death rate of any developed nation.

美国孕产妇死亡率已居于所有发达国家榜首。

This is called the " maternal death" rate. The worst rate of maternal death in Nigeria is in the northern region.

这就是所谓“产妇死亡率”，尼日利亚产妇死亡率最高的地方在北部地区。

Liberia already suffers one the world's highest maternal death rates.

利比里亚已经是世界上孕产妇死亡率最高的国家之一。

A report by the campaign group Save The Children has highlighted the high maternal death rate in the United States compared to other developed countries.

活动组织救助儿童会发布的报告表明与其他发达国家相比，美国的孕产妇死亡率很高。