Production of the sleep hormone melatonin begins at dark.
睡眠荷尔蒙褪黑素在夜间开始分泌。
The night was dark and quiet; my blood ran cold when I heard a strange noise outside at dark night.
夜晚黑暗而宁静；漆黑夜色中听到外面有奇怪的声响，我感到毛骨悚然。
A man hunted for a fox and finally lost himself in the forest. He walked around anxiously. At dark he met an old lady with white hair.
一个人在森林里追赶一只狐狸后来迷了路。他焦急地四处乱窜。黄昏时他遇到了因为满头白发的老太太。
The animation uses a "hot metal" colour scale that begins at dark red and progresses through orange and yellow to white at the highest levels of activity.
影片里用色线标出了活动等级：由深红开始，逐步过渡桔红，再到黄色，进而显成白色这一最高等级。
Night frogs are extremely hard to find, coming out only at dark and during the monsoon season, living either in fast-flowing streams or on moist forest ground.
夜蛙往往极难发现，他们生活在水流湍急的溪流中或者潮湿的森林地带并且仅在雨季的夜间才会出来活动。
He used the same cinematographer, Owen Roizman, to create a dark, intense atmosphere which was very un-American at the time.
他使用了同一个的电影摄影师，欧文•鲁伊兹曼，创造了一种当时美国人很不习惯的阴暗紧张的氛围。
Access was gained to these shops through the small alleyway at the back of the properties—it's dark and as you can imagine, no one saw the thief or thieves in action.
通过房子后面的小巷子可以进入这些商店，那里很黑，你可以想象不会有人看到小偷的行动。
In the old days at home the Neverland had always begun to look a little dark and threatening by bedtime.
在以前的日子里，缥缈国在睡觉前总是显得有点阴暗和吓人。
She looked at them with dark staring eyes.
她那双深色的眼睛专注地看着他们。
The eyes behind the lenses were dark and quick-moving, taking in everything at a glance.
镜片后的眼睛黑黑的且快速转动着，一眼就能看清一切。
A leatherback may be able to pick up some body heat by basking at the surface; its dark, almost black body color may help it to absorb solar radiation.
棱皮龟可以通过在水面上晒太阳来为身体获取热量；深色近乎黑色的身体颜色可以帮助它吸收太阳辐射。
The dusk light was failing and the interior of the pickup was dark but she knew the occupant was staring at her.
黄昏的光线逐渐暗淡下来，皮卡内黑漆漆的，但她知道占有者一直在盯着她。
They do chores at home and hopefully manage to find some time to study before it gets dark.
他们在家做家务，希望能在天黑前找到时间学习。
They don't meet in the daytime; they meet either early before light, at dawn, or after dark, at night.
他们不在白天见面；他们要么在黎明前相遇，要么在黄昏后相遇。
It is through widespread loss of memory that civilizations are at risk of falling into a dark age.
正是由于广泛的记忆丧失，文明才有陷入黑暗时代的危险。
Lawmakers and regulators are slowly starting to address the ambiguity around dark patterns, most recently at the state level.
立法者和监管者正慢慢开始设法厘清黑暗模式相关法律的模糊之处，其最近行动开展于州级层面。
Suspended on their stilts, the actors remove their masks and reveal their off-white faces, staring terrified at a sunless sky, dark clouds congregating.
演员们被吊在高跷上，他们摘下面具，露出他们苍白的脸，惊恐地盯着没有阳光，乌云聚集在一起的天空。
The first and fourth decile is full at the end of Clemens family coat of arms, had dark brown across the middle bar to separate three same Blackbird.
第一和第四等分是门斯家族的全底纹章，中间横穿过的深褐色棒把三只相同的黑鸟分开。
When I climbed into my bunk at midnight, dark thoughts joined me.
当我半夜里我爬上了自己的铺位时，脑子里愁云密布。
Tom, take the umbrella with you. Look at the dark sky, it's going to rain.
汤姆，把伞带上。看那阴沉的天，要下雨了。
"Dark and sinister man," Peter answered, "have at thee."
“黑暗而愤世嫉俗的人，”彼得回答说，“来吧。”
—Shall we grow for a walk? —Don't be silly. It's too dark. We'd better stay at home.
——我们要不要出去走走？ ——别傻了。天太黑了。我们最好待在家里。
At last the giant came to his house—a dark place.
最后，巨人来到了他的房子——一个黑暗的地方。
There, space tourists will be able to look back at the Earth and out to dark space and the sight of millions of stars.
在那里，太空游客将能够回望地球，望向黑暗的太空，以及看到数以百万计的恒星。
She is short with dark hair, in her fifties, and we'd even smiled at each other once or twice.
她身材矮小，头发乌黑，五十多岁，我们甚至对着对方笑过一两次。
At that moment, Ma noticed the deliveryman's face and hands were dark purple because he was working outside for too long.
那一刻，马注意到，外卖送餐员的脸和手都是深紫色的，因为他在户外工作太久了。
Usually, you must sleep for at least seven to eight hours every day, or you will get dark circles under the eyes.
通常，你必须每天至少睡7-8小时，否则你会有黑眼圈。
Have you ever walked alone at night through a dark alley or down a lonely country road?
你有过夜半三更独自走在黑暗的小巷或是乡间野路的经历吗？
"The sky is so clear, and the stars are so bright here," I mused as I leaned against the balcony and looked up at the dark sky.
“天空是那么晴朗星星是如此的明亮”我一边斜倚在阳台上抬起头看着那黑暗的天空，一边若有所思地说道。
Soon after the upgrades, Hubble took aim at a dark patch of sky, gathering infrared light for a total of four days to detect the very faintest objects.
更新后不久，哈勃便把目标锁定太空的一处黑暗区。在连续收集了四天红外光后，哈勃发现了极其微弱的物体。
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