首先按顺时针方向活动眼睛，然后逆时针方向活动。
First start in clockwise direction then repeat in an anti clockwise direction.
人们发现，连续一年被关在黑暗的环境中的鲎仍然可以保持稳定的大脑活动节奏，这种稳定的节奏也使得它们的眼睛适应每日或明或暗的光线。
Horseshoe crabs kept in the dark continuously for a year were found to maintain a persistent rhythm of brain activity that similarly adapts their eyes on a daily schedule for bright or for weak light.
我们是白天活动的生物，眼睛已经适应了在阳光下的生活。
We are diurnal creatures, with eyes adapted to living in the sun's light.
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