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来源：雅诚德英语网
Which raises the evolutionary question of why men and women who are exclusive gay and lesbian exist.
这就引起了一个进化问题：为什么人类是唯一存在基于情感的断背和拉拉的物种？
Which raises the evolutionary question of why men and women who are exclusive gay and lesbian exist.
这就引起了一个进化问题：为什么人类是唯一存在基于情感的断背和拉拉的物种？