As far as causes of bulimia go, it's been shown to have a genetic component, based on twin and adoption studies.

就暴食症的病因而言，它已被证明具有遗传成分，此结论是基于双胞胎研究及收养研究得出的。

So let's look at the scientific evidence, and the best place for that is the wealth of twin and adoption studies, which have been fascinatingly helpful in illustrating how genetics and environment can both influence intelligence.

因此，让我们看看科学证据，最好的证据是大量的双胞胎和收养研究， 这些研究非常有助于说明遗传和环境如何同时影响智力。

Although no one has found a single genetic predictor of Antisocial Personality Disorder, twin and adoption studies do show that relatives of those with psychopathic features do have a higher likelihood of engaging in psychopathic behavior themselves.

虽然没有人发现反社会人格障碍的单一遗传预测因子，但双胞胎和收养研究确实表明， 具有精神病特征的人的亲属本身确实更有可能从事精神病行为。