Grain exporting countries have consequently started restricting the amount of grain they export, postponing sales or imposing in some cases prohibitive export tariffs to keep their local market well supplied, avoiding politically damaging food price increases. 因此,有些粮食出口国已开始限制出口数量,推迟出口销售,或对某些农产品征收限制性出口关税,以保证当地市场供应,避免粮食价格上涨带来政治影响。