Geographical isolation is even more extreme if the country is landlocked, like Bolivia, Afghanistan, Ethiopia, or Burkina Faso. In addition to isolation, other problems include droughts in Africa, where farmers depend on rainfall rather than irrigation, and high disease burdens in tropical countries suffering from malaria, dengue fever, and other killer diseases.
如果一个国家是内陆国，如玻利维亚、阿富汗、埃塞俄比亚、布基纳罚索，地理隔绝甚至更加严重。除了隔绝，其他问题还有如非洲的干旱（那里的农民依赖于降雨超过灌溉），热带国家遭遇疟疾、登革热以及其它致命疾病的疾病负担。