infertile reproductive cycle

例句：

1. 1. The couple's infertilereproductive cycle was a major causeof their unsuccessful attempts to conceive.
   这对夫妇的不育生殖周期是他们尝试怀孕失败的主要原因。
2. 2. During theinfertile reproductive cycle, women often experiencesymptoms such as irregular menstrualcycles and difficulty conceiving.
   在不育生殖周期期间，女性经常会出现月经不规律和难以受孕的症状。
3. 3. Researchershave identified several factors that can contribute toan individual's infertile reproductive cycle, including genetic predisposition and environmental stressors.
   研究人员已经确定了几种因素，可以导致个体的不育生殖周期，包括遗传因素和环境压力。