这只是动荡时期最新出现的忧虑因素，粮食动荡始于两年前，当时全球范围的价格猛涨导致非洲和亚洲的很多国家面临着粮食短缺的袭击。
These are just the latest sources of concern in a turbulent period that began two years ago when food shortages hit many countries in Africa and Asia due to a worldwide spike in prices.