即使没有回报，猴子也要继续完成任务。
The monkey keeps on doing the task, even without being rewarded for doing it.
即使你的善行没有带来任何具体的回报，至少行善的人有机会享受一种精神上的启迪。
Even if there is no concrete benefit paid in response to your good deed, at the very least, the doer of the good deed has the opportunity to enjoy a kind of spiritually enlightened moment.
根据发表在《心理科学》杂志上的研究，这可能是因为整数对我们来说有内在激励，即使实现他们并没有明显的回报。
Well it may be because round numbers are intrinsically motivating to us, even if there's no obvious reward for reaching them. That's according to a study in the journal Psychological Science.
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