最大的损失者将为不发达国家，特别是撒哈拉以南的非洲国家。
The big losers will be the undeveloped countries, especially in sub-Saharan Africa.
在撒哈拉以南的非洲，植物专家正在帮助他们种植一种新的红薯。
In sub Saharan Africa, plant experts are helping them grow a kind of new sweet potatoes.
它被认为是在20世纪初起源于南美洲，后来传播到欧洲，然后跨越到撒哈拉以南的非洲。
It is believed to have originated in South America in the early 1900s, and later spread to Europe before crossing over to sub-Saharan Africa.
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