The second form is reciprocal altruism, or “you scratch my back and I'll scratch yours”.(另一種形式則是互惠型的利他行為，或稱為“狼狽為奸，唯利是圖”。)

We'd get about as much altruism from an ant colony.(我們能從一群螞蟻身上得到同樣的利他主義。)

Fortunately, volunteers are not motivated by self-interest, but by altruism.(幸運的是，志愿者們不是被自身利益而是被利他主義推動。)

Altruism is another big draw to the company garden.(利他主義是公司菜園的另一大收獲。)

"Altruism makes people calmer and more fulfilled," Biddulph says.(“無私讓人們更加平和、充實，”Biddulph說。)

Hippies preach altruism and mysticism, honesty, joy and nonviolence.(嬉皮士宣揚利他主義和神秘主義，誠實、喜悅與非暴力。)

Unsurprisingly, with altruism the only incentive, not enough people offer.(由于利他主義是捐腎者唯一的動機，也就難怪沒有足夠多的人來捐獻了。)

Meanwhile, other ACTS of seeming altruism are often just reciprocity.(與此同時，其他一些表面上看來的利他主義行為往往也僅僅是互惠。)

And then we'll move towards altruism, towards non kin.(然后我會講對非親人的利他主義。)

Still, doubting altruism is easy, even when it seems at first glance to be apparent.(盡管如此，質疑利他主義還是很容易，即便它一目了然。)