translation.en: We don't share it with the other three apes, the gorilla, the orangutan and the gibbon, who are more typical of mammals, having sex only about a dozen times per birth.
translation.zh: 但是我们和其它三种更典型的哺乳动物 类人猿的比例不同， 比如大猩猩，猩猩，和长臂猿。 这些类人猿每次出生大约 只有十二次性交。