Move the left triangle slider to the right until the dark colors in the image are almost black. You can see the Settings I used in the image below.

将移动左边的三角形滚动条向右移动，直到图片里的暗色几乎是黑色的，你可以在下图中看到我的设置过程。

youdao

youdao

youdao

The twenty-two men rested until dark, listening to rain hit the roof of the farm house.

VOA: special.2009.06.18

Every year millions of water birds arrive from the Arctic to UK coasts, but until now scientists remained largely in the dark about how these birds respond to the bright lights of coastal cities and industry.

BBC: Grangemouth and Longannet lights help birds feed at night

Until now, the hunt for dark matter has proved elusive.

BBC: Dark Matter: Experiment to shed light on dark particles

It fell out from under the cars and drivers who were at a standstill, and rescuers were pulling people in cars out of the Mississippi River until dark last night.

NPR: Minn. Bridge Work Focused on Road Surface