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.
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。
I will go around the city of Dalian by light—rail vehicle instead of subway because I haven't taken it before.
因为之前没坐过地铁，所以我会坐轻轨车环绕大连市区。
The glow may be caused by light reflected from nearby stars.
发出的光可能是邻居恒星光线折射造成的。
The damage caused by light pollution comes from poorly designed outdoor lighting.
光污染造成的破坏，来自户外照明的设计不当。
But some minor roads in coastal areas are still blocked or can be used only by light vehicles.
但是，在一些沿海地区，一些小的道路仍然受阻或者只能承受轻便的车辆通过。
The rare phenomenon is created by light reflected from ice crystals in high-up cirrus clouds.
而这个罕见现象是由于在位置较高卷云中的冰晶反射闪电而产生的。
The current collection of SOA books and articles is rich on high-level theory by light on practical advice
现有的SOA书籍和文章有很多高层理论，而缺乏实际的建议
It was created by light from the moon shining through cloud vapour suspended 10, 000ft up the rim of a volcano in Hawaii.
在夏威夷的一座火山上方10000英尺处的高空中，月光穿越云层雾气形成了一道彩虹。
The brain regions that were affected by light are also typically involved in attention and arousal regulation, Vandewalle said.
被光线影响的大脑区域主要与“注意力”和“觉醒机制”有关。
The size and electrical properties of nitrogen trioxide, though, are such that it is easily broken up by light into nitrogen and ozone.
但是，三氧化二氮分子的大小与电特性使它很容易被光线分解成氮和臭氧。
This means that light from a star that Kepler is examining is sometimes "polluted" by light from other stars that appear near to it in the sky.
原因是有时开普勒观察到的来自恒星的光会被其它邻近恒星所发出的光给误导。
Physical objects, when struck by light (the visible kind, see electromagnetic radiation), will reflect back certain wavelengths of light to your eyes.
一个物体，受到光线照射(可以看得到的物体，见电磁辐射)，将会把某些波长的光反射到你的眼睛里。
Red aurora are generated by light emitted at a longer wavelength (0.630 micrometers), and other colors such as blue and purple are also sometimes observed.
红色的极光是由较长波长(0.630微米)的发出光引起的，有时也会观察到其他诸如蓝色和紫色的极光。
In the most modern LCDs this light is generated by light-emitting diodes (LEDs) and is then diffused in a special layer of the screen behind the shutters.
大多数现代的液晶显示器通过发光两极管(LEDs)产生这种白光，并使其漫射到遮光栅栏后的屏幕专用漫射层上。
The most memorable cities of the future are characterised more by darkness, by the survival of fragments of a recognisable present, than by light and efficiency.
未来最令人难以忘怀的城市会更多的以黑暗、依稀可辨的遗迹为特征，而不是通明的灯火及高效的运转。
For example, one layer contains the active material that releases an electron when it's struck by light and another layer contains the circuit that carries the current.
例如，放置活化材料的一层，当它被光照时，便会释放电子，而电路层则负责传送电子流。
After a century as a primary source of artificial light these energy-guzzling bulbs are set to be replaced by light-emitting diodes (LEDs), powered by semiconductors.
在过去的一个世纪中，白炽灯泡一直为人造灯源的基本产品；但现在，耗能惊人的白炽灯泡注定将被由半导体驱动的发光二极管(LED)所替代。
On Earth, atmospheric methane is generated by living organisms, but on Jupiter and other gas giants, methane is produced by light interacting with other chemicals in the atmosphere.
地球大气层中的甲烷是由活体生物产生的，而木星或其他气态行星上的甲烷是由光与大气层中其他化学物质相互作用而产生的。
When one of the dye molecules is hit by light of sufficient energy, an electron is knocked out of it and absorbed by the titanium dioxide, before being passed out of the cell to do useful work.
一旦染料分子被有足够能量的光碰触，电子就会脱离并被二氧化钛吸收，在穿离电池之前发电。
The natural internal clock that controls our 24-hour cycle of sleep and waking, circadian rhythms are easily upset by changes in schedule, and they're greatly affected by light and darkness.
控制我们24小时睡眠和清醒生理周期的自然生物钟，生理的节奏很容易会被改变的时间表扰乱，他们深受光线和黑暗的影响。
During the eclipse, the best viewing in North America found the coppery lunar disc high in a cold winter sky, the Moon reddened by light filtering into the Earth's dark central shadow or umbra.
在这次月食中，在北美洲最佳观测点可以看到在寒冬的天空中出现一轮铜黄色的月盘，这是因为月亮由于地球黯淡阴影的中心滤过的光芒而变红了。
A spectrum is formed by a ray of light passing through a prism.
一束光通过棱镜就会形成光谱。
An animal can hide from predators by choosing the light environment in which its pattern is least visible.
动物可以通过选择一个光线最不明显的环境来躲避捕食者。
These rings are indicative of the crystal structure of nickel and can be explained only by invoking wavelike properties of light.
这些光圈表明了了镍的晶体结构，而且只能通过光线中波的特征来解释。
Photoreceptors are cells that respond to light by sending out a chemical signal.
光感受器是通过发出化学信号来对光作出反应的细胞。
This could, argues Angel, reduce the amount of light reaching the Earth by two per cent.
安吉尔认为，这将使到达地球的光量减少2%。
To demonstrate their approach, they added the genes to a bacterium and found that a flask of the bacterial culture produced enough light to read a book by.
为了展示他们的方法，他们给一种细菌添加了这种基因，并发现培养细菌的烧瓶中放出的光足可以在旁边看书。
Other species take into account the changing conditions of light by performing their visual displays only when the light is favorable.
其他物种只在光线适宜时才会展示它们的视觉形象，以此来考虑光的变化情况。
Other species take into account the changing conditions of light by performing their visual displays only when the light is favorable.
其他物种只在光线适宜时才会展示它们的视觉形象，以此来考虑光的变化情况。
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