据《美国医学会杂志》预测，2008年度的销售额还会下降1.2个百分点。

JAMA predicts a further sales decline of 1.2 percent in 2008.

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忠诚的客户越来越少，全球竞争日益激烈，这些因素让销售额更加难以预测。

Customers are less loyal, and global competition more fierce, making it difficult to predict where sales are going.

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人工神经网络的诸多特性能较好地处理粮食销售额预测问题。

Many characters of manpower nerve net can deal with the problems in food sale forecast well.

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