乾隆时期，中国的社会经济虽然取得了很大成就，但粮食短缺却成为日益严重的社会问题。

In The Times of Qianlong emperor, China had obtained great achivement in the social economy, but the grain shortage became a more and more serious social problem.

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在许多国家里，生产性表土的流失已导致日益严重的粮食短缺。

In many countries the loss of productive topsoil has contributed to growing food deficits.

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