造成这种现象的原因多种多样。
造成这种现象的一部分原因是这个地区的各个经济体从来没有积累或者投入足够多的财富。
Part of the problem is that the region neither saves nor invests enough.
导致这种现象的原因是恶劣天气造成的短缺威胁。
One reason for this is the threat of shortages caused by bad weather.
导致这种现象的原因是恶劣天气造成的短缺威胁。
One reason for this is the threat of shortages caused by bad weather.
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