天突然变暗了。
灰尘也能使云朵变暗。
碰撞的力量将大量碎片喷射到大气中，在更细的粒子落下之前，天空会变暗几年。
The force of collision spewed large amounts of debris into the atmosphere, darkening the skies for several years before the finer particles settled.
就在灯变暗之前，我看见我的父亲冲进大厅，坐在我的母亲旁边。
Just before the lights turned dark, I saw my father rush into the hall and take the seat beside my mother.
卡罗摄影法对化学处理纸的使用是革命性的，其中光照区域色调变暗，形成负像。
The calotype was revolutionary in its use of chemically treated paper in which areas hit by light became dark in tone, producing a negative image.
乔治看见屏幕变暗，接着出现了几个字。
George saw the monitor black out and then a few words faded in.
西顿躺在床上凝视着天花板， 那时光线逐渐变暗。
Seaton lay on his bed and gazed at the ceiling as the light faded.
这包括使用硫或硫化氢气溶胶，使二氧化硫形成云层，进而导致全球变暗。
This would involve using sulphur or hydrogen sulphide aerosols so that sulphur dioxide would form clouds, which would, in turn, lead to global dimming.
第二种保证在10年内看起来很好，而便宜的那种大约在6、7年后就会开始变暗。
The second is guaranteed to look great for about 10 years, whereas the cheaper one will start to dull after around 6 or 7 years.
很多霓虹灯都变暗了，取而代之的是更实用，但是不那么浪漫的LED 灯。
Many of them are going dark, replaced by more practical, but less romantic, LEDs.
当灯光变暗时，你就要去睡觉了。
我们关上百叶窗，使房间变暗了。
但是美国的前景突然变暗淡了。
太阳下山时天空的颜色变暗。
风向的突然改变暗示着一场暴风雨。
天色变暗时我们进入了爱荷华，餐车开饭了。
As the sky darkened, we entered Iowa. And dinner was announced.
但这种颜色暴露在阳光下将会变暗。
例如，他们不能解释水是怎样使土壤变暗的。
They cannot, for example, explain how the water darkened the soil.
下面我要谈论的是光线变暗时拍出好照片的技巧。
So let me offer a few tips about taking successful pictures when the light gets low.
坏死的组织会变得蓝、发白、变暗或是出现片状斑驳。
The wound itself may appear necrotic and look bluish, white or dark, flaky and mottled.
几乎90%的女性在怀孕中期都会经历一些形式的皮肤变暗。
Almost 90 percent of women experience some form of skin darkening beginning in the second trimester.
一般而言，这种情况无碍健康，但会导致永久性的肤色变暗。
It's generally harmless but can cause permanent skin darkening.
天空变暗了。
给你们看几张幻灯片，我顺便遮掉这个,这样教室就变暗了。
Now I would like to show you a few slides, and I might as well cover this up so that we get it very dark in this room.
罗森塔尔表示：“你的背后不应该有亮光，因为这会让你的脸色变暗。”
"There shouldn't be light behind you, because it will darken your face," Rosenthal says.
然后前照灯和汽车引擎开始工作，两个红色的尾灯变暗，很快消失了。
Then headlights and engines came to life. Two sets of red taillights dimmed and soon disappeared.
看，天空正在慢慢变暗，正在下山的太阳给大地洒下一片金色的余辉。
Look, the sky is getting dim gradually. The setting sun is covering the earth with golden rays.
看，天空正在慢慢变暗，正在下山的太阳给大地洒下一片金色的余辉。
Look, the sky is getting dim gradually. The setting sun is covering the earth with golden rays.
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