You also learned about altruism, the bystander effect, and when we are more or less likely to help a person in need, and also about the social exchange theory, the reciprocity norm, the social responsibility norm, and social traps.

您还了解了利他主义、 旁观者效应，以及我们何时或多或少地帮助有需要的人， 以及社会交换理论、 互惠规范、社会责任规范和社会陷阱。

But on a larger scale, you can find social traps taking their toll on the environment, like when we poach elephants to sell their ivory or cut down old growth forests to make a quick buck in the lumber market.

但在更大范围内，你会发现社会陷阱对环境造成了损害，比如我们偷猎大象来出售它们的象牙， 或者砍伐原始森林以在木材市场上快速赚钱。