When feedback from various operating units arrives, any forecast should be reviewed in the light of changing circumstances.

任何预测必须在各业务单位的情况反馈回来后，根据环境的变化重新考虑。

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Delphi method is a kind of dependable and visual forecast method with anonymity and feedback.

德尔菲方法是一种可靠的、直观的预测方法，具有匿名性、反馈性等特点。

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This kind of methods is also called as undulation forecast subtracting, which including wave field extrapolated method, feedback loop method and backscattering progression method.

这类方法也称为波动预测减去法，主要有：波场外推法、反馈环法、反散射级数法。

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