A UN-backed grain deal that has enabled Ukraine to export millions of tonnes of wheat is under strain as a surge in the number of cargo ships has caused a backlog aiming to cross the Black Sea.
联合国支持的一项谷物协议使乌克兰得以出口数百万吨小麦,但该协议正面临压力,原因是计划穿越黑海的货轮数量激增,造成了积压。
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