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The key obstacle is pregnant women's lack of access to quality care before, during and after childbirth.

存在的主要障碍是，孕妇在分娩前、分娩中及分娩后不能获得高质量的保健服务。

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But a key obstacle to reduce the amount of gas flared is the lack of infrastructure and available markets for the associated gas.

然而，减少天然气燃除的一个主要障碍是缺乏利用伴生气所需要的基础设施和现有市场。

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Last week, Zimbabwe's rival political leaders reached a deal over a new constitution, removing a key obstacle to holding elections.

BBC: South Africa court 'halts Zimbabwe helicopter donation'

The issue of settlements and their continued growth is a key obstacle in the path of reviving the moribund peace process between Israelis and Palestinians.

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One key obstacle is the acute shortage of healthcare workers in many poor countries, who are crucial to ensure treatments reach those who need them.

BBC: Plan to cut burden of tropical disease