• 1. And Difficult To Predict: 也很难预测

• 1.They are more common in summer than in winter, and difficult to predict.
  这种情况在夏天比冬天更常见，也很难预测。
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• 2.Currencies are notoriously volatile and difficult to predict. Even investment Banks with their armies of analysts frequently call it wrong.
  货币的不稳定性和难预测性是众所周知的，就连投资银行和它们的分析师军团，也常常会出现误判的哦。
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• 3.In production process, many complex factors which influence cost affect each other and the coupling phenomenon exists, so it is important and difficult to predict the cost.
  在生产过程中，影响产品成本的因素多而复杂，因素之间相互影响，存在耦合现象，因此准确预测成本是一个重要又难以解决的问题。
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