It is the change to darkness in the sky.
天空这变化意味着要进入黑暗。
Let not thine heart turn ever to darkness.
永远不让你的心转向黑暗。
Shade cannot exist without light: light can only be light when contrasted to darkness.
暗离开光是不存在的：当光对比于黑暗时光才能成为光。
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。
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 into the hills.
夜幕低垂，黑暗即将来临。阿尔瓦雷斯打开红外探照灯，继续我们山中的远足。
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。
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。
After a few minutes our eyes got used to the darkness.
几分钟后我们的眼睛就适应了黑暗。
We managed to lose our pursuers in the darkness.
我们设法在黑暗中摆脱了追赶者。
As darkness fell outside, they sat down to eat at long tables.
当外面黑暗降临时，他们坐在长条桌子旁吃饭。
They managed to escape under cover of darkness.
他们设法在夜色掩护下逃跑了。
As darkness fell, Clinton gave orders for his men to rest.
夜幕降临时，克林顿下命令让自己的人休息。
For instance, if a homing pigeon is to navigate with its Sun compass, its clock must be properly set by cues provided by the daylight/darkness cycle.
例如，如果一只信鸽要用它的太阳罗盘进行导航，它必须根据日光/黑暗的循环所提供的线索正确设置时间。
What does Mass want to tell us by writing "At the edge of darkness"?
Mass写《在黑暗的边缘》想告诉我们什么？
More recently, companies have begun to plan more affordable "suborbital" flights—briefer ventures just to the edge of space's vast darkness.
最近，一些公司已经开始计划更经济实惠的“亚轨道”飞行——在太空无际黑暗的边缘进行更短时间的冒险。
Luna 16 landed on the lunar surface (in total darkness, no less), collected moon rocks, packed them up, and returned them to Earth.
“月球16号”降落在月球表面(完全是在黑暗中)，收集了月球岩石，打包，然后带回地球。
But more recently, companies have begun to plan more affordable "suborbital" flights—briefer ventures just to the edge of space's vast darkness.
但是最近，公司已经开始计划更便宜的“亚轨道”飞行，在太空无际黑暗的边缘进行更短时间的冒险。
I set out in darkness on Huntington Beach in California to run across America, one of a handful of competitors in the LA to NY Footrace 2011.
我在加利福尼亚州亨廷顿海滩摸黑出发跑步穿越美国，我是2011年洛杉矶到纽约竞走大赛为数不多的竞争者之一。
Sometimes it is wiser to stand still than to advance in darkness.
有时在黑暗中站着不动比前进更明智。
In Denmark, there can be up to 17 hours of darkness per day in winter, and the average temperature is around 0℃.
在丹麦，冬天每天有长达17个小时的黑夜，平均气温在0℃左右。
Besides the darkness, the plants can't stand the cold (it can drop to -170℃ on the moon at night).
除去无光因素，这些植物还不耐冻（月球夜间温度可降至零下170摄氏度）。
As darkness came over the field and the match ended, the goal keeper, Juan, walked over to me and said in a matter of fact way, "In your home, do you have a moon too?"
夜幕降临赛场时，比赛结束，守门员胡安走到我身边，面不改色地问我：“你家也有月亮吗？”
As darkness came over the field and the match ended, the goal keeper, Juan, walked over to me and said in a matter of fact way, "In your home, do you have a moon too?"
夜幕降临赛场时，比赛结束，守门员胡安走到我身边，面不改色地问我：“你家也有月亮吗？”
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