这是在斯堪的纳维亚半岛北部一个冬天的黑暗夜晚，我一直梦想着要看到这些神奇的灯光。
It was during a dark winter night in the northern part of Scandinavia. I had always dreamt of seeing these magical lights.
在北京大学一栋老建筑里，一盏黄色的灯照亮了古老而黑暗的夜晚。
In an old building in Peking University, a yellow light shone into the old and dark hours of the night.
人类的褪黑激素水平在夜晚上升，以响应黑暗和昼夜节律钟发出的信号。
In humans melatonin levels rise at night, in response to darkness and cues from the circadian clock.
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