动情周期

例句：

1. 1. The study of human emotions has a long history, and researchers have identified several patterns in the emotional cyclesof different cultures.
   对人类情感的研究历史悠久，研究人员已经识别出不同文化中情感周期的几种模式。
2. 2. During the romantic phase, couples often experience intense feelings of love and passion, which can last for several years or even decades.
   在浪漫阶段，情侣通常经历强烈的爱情和激情，这种感受可以持续数年甚至数十年。
3. 3. As time passes, people's emotional cycles may shift, leading to changes in their relationships and behaviors.
   随着时间的流逝，人们的情感周期可能会发生变化，导致他们的关系和行为发生改变。