In all the experiments, 80% or less of flies learned a mate preference from observation.

在所有实验中，80% 或更少的果蝇通过观察学会了择偶偏好。

And in some of the sex differences, particularly related to aggression and mate preference, seem to be universal.

在一些性别差异中，特别是与攻击性和择偶偏好相关的性别差异似乎是普遍存在的。

Researchers tested to see whether showing several demonstrations of copulation would lead to a higher percentage of learned mate preference.

研究人员进行了测试，以了解展示多次交配示范是否会导致更高比例的习得择偶偏好。

When observer females saw equal proportions of demonstrator females copulating with green and pink males, the observer females had no mate preference.

当雌性观察者看到同等比例的示范雌性与绿色和粉色雄性交配时，雌性观察者没有择偶偏好。

Without a mechanism to correct for the 20% of flies that didn't learn, the mate preference should theoretically drop down to 51% by the third generation.

如果没有一种机制来纠正 20% 没有学习的果蝇，理论上，配偶偏好到第三代时应该会下降到 51%。