subsistence sector
的生存问题
以上为机器翻译结果，长、整句建议使用 人工翻译 。
"The prediction is that in the next 20 years to 30 years, if the situation continues to get worse, the productivity from the agricultural sector and from subsistence farming in Africa, the production would reduce by as much as 50 percent,".
VOA: standard.2010.01.02
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