We have been in a period of extraordinary volatility in food prices, which poses a real danger of irreparable harm to the most vulnerable nations, Mr Zoellick said, adding that food prices were the single gravest threat facing developing countries. 我们处在一个粮食价格波动极大的时期,这对最脆弱的国家构成了现实的威胁,可能造成无法弥补的损害,佐利克说。他还补充说粮食价格是发展中国家面临的最严峻的单一威胁。