自1990年以来，亚洲和北非的一些国家已使孕产妇死亡率减半。

Since 1990, some countries in Asia and Northern Africa have more than halved maternal mortality.

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研究模型已经显示艾滋病毒可能对孕产妇死亡率具有显著影响。

Already research models are showing that HIV may have a significant impact on maternal mortality.

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初步证据表明，艾滋病毒可能对孕产妇死亡率有显著影响。

Early evidence shows that HIV may have a significant impact on maternal mortality.

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