n. an instance of something occurring
n. 发生, 事件, 出现
[医] 发生
1. The occurrence of rain helped the plants grow.
下雨的发生帮助植物生长。
2. There was a strange occurrence in the sky last night.
昨晚天空发生了奇怪的现象。
3. We need to report any occurrence of theft to the police.
我们需要向警察报告任何盗窃事件。