那是在晚上，屋里的油灯光线暗淡。
研究人员发现当加强环境光时，老鼠的恐惧与光线暗淡时有所增强。
The researchers discovered that by intensifying the ambient light, the mice showed a greater fear reaction to the tone than when the light was dimmer.
这就叫做“暗光适应”。你的眼睛花上一个钟头就可以完全适应光线暗淡的环境。
This is called "dark adaptation" and it takes your eye up to an hour to become fully adapted to seeing in low light conditions.
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