But as karlan warns , not everyone is an altruist .

但卡兰警告称，不是所有人都是利他主义者。

Gunderson and colleagues studied 940 women catching chapter in a study of prenatal and postnatal upbeat at altruist medical school in boston .

甘德森及其同事对940名女性进行了研究，这些女性都参加过波士顿哈佛医学院的产前及产后健康研究。