引进到该地区的驴已变得越来越常见，而且它们特别有助于将作物和货物运输到市场。

Donkeys, which were imported to the district, have become more common and contribute, in particular, to the transportation of crops and goods to market.

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研究人员说，大麦是一个意外的发现：这种作物在欧亚大陆西部被引进，直到大约2000年前才成为中国中部地区的主食。

Barley was an unexpected find: the crop was domesticated in Western Eurasia and didn't become a staple food in central China until about 2, 000 years ago, according to the researchers.

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西非所有从某个未知的日期开始记录的主要农作物都是从其他地方引进的，刚开始是种植水稻和山药。

All the recorded staple crops grown in western Africa were introduced from elsewhere, beginning, at some unknown date, with rice and yams.

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