Throughout nature, only humans appear to use money so it may seem counter-intuitive that our use of money has an animal parallel.
环顾整个自然界，好像只有人类才使用货币，因此若说其他动物也有用货币乍听之下有点令人惊异。
2
Several factors could account for this phenomenon, which seems to run counter to the experiments where an animal learns to avoid electrodes after getting zapped a few times.