emergency的形容词是emergent
emergent：adj.新兴的;处于发展初期的；
emergency：n.突发事件;紧急情况；
复数： emergencies
The government has declared a state of emergency following the earthquake.
地震发生后***已宣布进入紧急状态。
Interactions among different levels lead to emergent properties.
自然属性源自不同尺度单元间的相互影响。
