occurrence ·noun (EXISTENCE)
Definition: the existence or presence of something Level: C1
先进的筛查技术现在可以在极早期发现某些癌症的存在。
Advanced screening can now detect the ___occurrence of some cancers at very early stages.
图表清晰地显示了近几十年来两个主要经济高峰的出现。
The graph clearly shows the ___occurrence of two major economic peaks in recent decades.
研究人员正在研究极端天气事件增多的现象。
Researchers are studying the increased ___occurrence of extreme weather events.