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。
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。
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。
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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