So this means that with more ovulatory cycles there's an increased risk of tumor formation.

这意味着排卵次数越多，肿瘤形成的风险就越大。

So things that are associated with a decreased risk of ovarian cancer include things that reduce the number of ovulatory cycles like pregnancy, breastfeeding, and oral contraceptive use.

所以与卵巢癌风险降低有关的事件包括减少排卵期次数的行为，例如妊娠和哺乳，还有口服避孕药的使用。

Each time cells divide there is a chance of a mutation and the possibility of tumor formation, and this means that with more ovulatory cycles, there's increased risk of tumor formation.

每一次细胞分裂时都有细胞突变的可能，同时也增加了肿瘤形成的可能性，而这也意味着排卵期的循环提高了癌变的风险。