The use of light and dark symbolizes good and evil.

用光明与黑暗来象征善与恶。

《牛津词典》

Research suggests that babies learn to see by distinguishing between areas of light and dark.

研究显示婴儿是通过区分明亮区域和黑暗区域来学会观看的。

《柯林斯英汉双解大词典》

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。

《牛津词典》

In "Family of Man," a dark-haired, light-eyed woman with a bright blue head covering looks intensely at something hidden from view.

VOA: special.2009.11.20

First,they don't meet in the daytime; they meet either early before light,at dawn, or after dark,at night.

首先，他们不在白天聚会;,要么在天亮前的黎明，要么在天黑后的夜晚。

耶鲁公开课 - 新约课程节选

That's because it's here where the rigid polarities between light and dark and good and evil, all of these absolute oppositions, begin to collapse.

这是因为这里就是光与暗,善与恶之间严格的两极分化，及所有绝对的对比开始崩塌的地方。

耶鲁公开课 - 弥尔顿课程节选

Due to the limited number of electrodes, patients would only be able to discern light or dark, but most have reported better functionality with the device -- being able to make out the shape of a curb while walking, or discerning between light, grey or dark colored socks, for instance.

ENGADGET

"The good news is that people who stay up late in front of the television and computer may be able to undo some of the harmful effects just by going back to a regular light-dark cycle and minimizing their exposure to artificial light at night, " Bedrosian says.

CNN: Unplug! Too much light at night may lead to depression

On the other, the place where light and dark green had merged becomes blurred, diffused by the light itself.

BBC: How to buy jade in Asia