1. in the dark在黑暗中
I had to feel about in the dark for the light switch.
我得在黑暗中摸索寻找电灯开关。
She groped blindly for the light switch in the dark room.
她在黑暗的房间里摸索电灯开关。
I'm frightened of walking home alone in the dark.
我害怕在黑夜单独走路回家。
Cats can see in the dark.
猫在黑暗中能看见东西。
It took a few moments for her eyes to focus in the dark.
过了好几分钟她的眼睛才适应了黑暗。
Ghostly shapes moved around in the dark.
有几个鬼一样的影子在黑暗中游荡。
We were stumbling around in the dark looking for a candle.
黑暗中，我们东跌西撞地找蜡烛。
I stumbled along in the dark, trusting to luck to find the right door.
我摸黑跌跌撞撞地往前走，全凭运气去找对门。
Her eyes gleamed in the dark.
她的眼睛在黑暗中闪烁。
Camp fires flared like beacons in the dark.
营火突然熊熊燃烧起来，看上去就像黑暗中的航标灯。
I'm frightened of walking home alone in the dark.
我害怕在黑夜单独走路回家。
She crouched in the dark, too frightened to reveal herself.
她蜷缩在黑暗中，吓得不敢露面。
I've been groping in the dark in a number of years.
多年来，我一直在黑暗中摸索。
2. 对某事全然不知，一无所知，蒙在鼓里，茫然无知
后面常接 about，常用于搭配 keep sb in the dark 中，例如：
Workers were kept in the dark about the plans to sell the company.
工人全然不知出售公司的计划。
I'm really sorry that I kept you in the dark about my promotion but management thought it would create problems within the team.
我真的很抱歉让你对我的晋升一无所知，但管理层认为这会给团队带来问题。
I managed to keep my parents in the dark about this
我设法对父母瞒下了此事。
I'm as much in the dark as you.
我和你一样毫不知情。
The investigators admit that they are completely in the dark about the killing
调查人员承认他们对这起谋杀一无所知。
How come they left you in the dark?
他们怎么把你蒙在鼓里？