They turn the light on at dark.
他们天黑时开灯。
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 hunters camped by the lake at dark.
天黑时，猎人们在湖边宿营。
The bar street has many customers even at dark nights.
酒吧一条街的生意在深夜都很好。
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。
I can't see her at all, cos it's too dark.
天太黑，我根本看不见她。
It was cold and dark when I woke at 6:30.
我6点30分醒来时，天又冷又黑。
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。
At night, the dark streets become menacing.
在夜晚，漆黑的街道变得阴森森的。
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。
She arrived at the meeting as much in the dark as everyone else.
她到会时与其他人一样毫不知情。
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。
When at last they awoke, it was already dark night.
当他们终于醒来时，天已经黑了。
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。
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。
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。
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