catastrophe set

Nine years after the defining moment of the 21st century, a stunning set of photographs taken by New York Police helicopters forces us to look afresh at a catastrophe we assumed we knew so well.

从发生在二十一世纪伊始的这个历史性时刻至今已经过去九年，由纽约警察直升机航拍的这一系列令人震惊的照片迫使我们重新去审视这个我们自以为已经了解甚深的人类灾难。

The prediction is conducted with the grey catastrophe model through the abrupt date set composed of abnormality times.

根据异常时刻组成的灾变日期集用灰色灾变模型进行预测。

On the basis of the thin plate theory, the cusp catastrophe model of water outburst at vertical shaft floor could be set.

在薄板理论的基础上，建立了立井井筒底板突水的突变模型。