They have had a succession of bad harvests in the last four years.
过去四年他们遭遇一连串歉收。
A sequence of bad harvests forced some African countries to ask for foreign aid.
连续的歉收迫使一些非洲国家要求国外援助。
But recent price rises have been too broad-based and long-lasting to be adequately explained by frost or bad harvests.
但最近如此大范围、长时间的价格上升,已经难以用大雾或者收成不好来恰当解释。
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