Fear was demonstrated by their heart beats decreasing, in a similar way to how our heart rate increases when someone gives us a fright.
通过它们心跳的下降可以得知它们感到了恐惧；类似的，我们人类感到恐惧时的反应是心跳加快。
Fear was demonstrated by their heart beats decreasing, in a similar way to how our heart rate increases when someone gives us a fright.
通过它们心跳的下降可以得知它们感到了恐惧；类似的，我们人类感到恐惧时的反应是心跳加快。
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