Occurrence regularity

• 发生规律

occurrence regularity的用法和样例：

例句

1. Study on the pathogenisis regularity of root rot on Atractylodes macrocephala Koidz.
   白术根腐病发生规律研究。
2. The occurrence rules of rice planthopper in rice field with cultural crab was ascertained through systemic investigation and field census.
   通过系统调查和大田普查相结合的方法，研究明确了养蟹稻田稻飞虱的发生规律。