世卫组织新的政策建议严谨地分析了众多国家在边远和农村地区提供医疗方面的一大瓶颈。
WHO's new policy recommendations rigorously analyse a key bottleneck to medical delivery in the remote and rural areas of many countries.
在一些偏远和欠发达地区，运动器材缺失也是一个瓶颈。
Access to sports facilities also remains a bottleneck in some remote and less-developed areas.
当一群人在60,000年前走出非洲大陆移居其他地区的时候，其他瓶颈也曾出现过。
Other bottlenecks occurred when a few individuals migrated out of Africa around 60,000 years ago and colonised other regions.
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