But in reality, identifying the best way of doing it can be difficult, whether for individuals seeking romance, or scientists studying reproductive behaviour.
但是在现实世界中，无论是个体为了追寻浪漫爱情，还是科学家们为了研究生殖行为，找寻一种正确的方式来实践却都困难重重。
The performances of the change in reproductive behaviour are the number of births, fertility preferences and other aspects , which will surely lead to changes in the structure of the family.
生育行为的变化则外化为生育数量、生育偏好等方面的转变，转变的结果是家庭结构的变化。
The performances of the change in reproductive behaviour are the number of births, fertility preferences and other aspects , which will surely lead to changes in the structure of the family.
生育行为的变化则外化为生育数量、生育偏好等方面的转变，转变的结果是家庭结构的变化。
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