The UN humanitarian chief Steven O'Brien said conditions in Aleppo had descended into a merciless abyss of humanitarian catastrophy.
联合国人道主义事务负责人奥布莱恩(Stephen O'Brien)表示，阿勒颇的形势已经陷入人道主义灾难的残酷深渊。
Catastrophy
原声例句
BBC 听力 2016年10月合集
英语百科
Catastrophe theory
（重定向自Catastrophy）
In mathematics, catastrophe theory is a branch of bifurcation theory in the study of dynamical systems; it is also a particular special case of more general singularity theory in geometry.
Bifurcation theory studies and classifies phenomena characterized by sudden shifts in behavior arising from small changes in circumstances, analysing how the qualitative nature of equation solutions depends on the parameters that appear in the equation. This may lead to sudden and dramatic changes, for example the unpredictable timing and magnitude of a landslide.
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