In humans melatonin levels rise at night, in response to darkness and cues from the circadian clock.
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。
As dusk turns to darkness, Álvares snaps on an infrared headlamp and we continue hiking intothe hills.
黄昏过后夜幕降临，阿瓦雷斯打开了红外线头灯，我们继续向山中走去。
According to Wauchope, holiness could be compared to light and evil compared to darkness.
根据沃克普，圣洁可以比作是光，邪恶可以比作是黑暗。
They are in the process of playing a hole when play is suspended by the Committee due to darkness.
他们在打一洞的过程中，委员会因天黑暂停了比赛。
Melatonin, a hormone produced by the pineal gland in response to darkness, is thought to play a primary role in controlling the body's circadian rhythm.
褪黑激素，黑暗时松果腺产生的一种激素，被认为在控制身体昼夜节律起主要作用。
Melatonin, a hormone produced by the pineal gland in response to darkness, is thought to play a primary role in controlling the body's circadian rhythm.
褪黑激素，黑暗时松果腺产生的一种激素，被认为在控制身体昼夜节律起主要作用。
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