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1·They turn the light on at dark.

他们天黑时开灯。

2·Production of the sleep hormone melatonin begins at dark.

睡眠荷尔蒙褪黑素在夜间开始分泌。

3·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。

4·The hunters camped by the lake at dark.

天黑时，猎人们在湖边宿营。

5·The bar street has many customers even at dark nights.

酒吧一条街的生意在深夜都很好。

6·At dark impermanent just pardoned to quit of, the apartment door rang to get up.

就在黑无常刚刚告退之时，宿舍门响了起来。

7·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。

8·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。

9·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。

10·I can't see her at all, cos it's too dark.

天太黑，我根本看不见她。《牛津词典》