随着二叠纪生命形式的衰退，它们达到了一个致命的临界点，物种最终走向了大灭绝。
As Permian life-forms declined, they reached a fatal threshold and species succumbed to mass extinction.
运用特征值分析与响应分析结合的方法，研究了系统失稳的临界流速与失稳形式。
The critical velocity and form of instability are studied by the means of eigenvalue and response analysis.
提出了一种在注入功率空间中求取电力系统实用动态安全域(PDSR)的超平面形式的临界稳定边界的新方法。
An effective method is proposed for obtaining the critical boundaries of hyper plan (HP) form of practical dynamic security regions (PDSR) of power systems in power injection space.
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