这些效应也被加州大学戴维斯分校的研究人员记录在册。
This effect was also documented by researchers at the University of California Davis.
研究人员记录了他们的大脑活动，发现同情心如同恐惧和愤怒一样根植于人类心灵的深处。
Researchers recorded their brain activity and found that empathy is as deeply rooted in the human psyche as fear and anger.
研究人员记录了会导致灭绝风险的物种数量变化事件，在这些事件中，物种的数量快速降到零。
The researchers documented changes to extinction risk, where species are moving most rapidly toward zero population.
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