Why does chlorophyll need protection when it is the natural world's supreme light absorber?
为什么叶绿素是自然界最高等的光吸收体，却需要保护？
The second problem is that Venus exhibits a halo of light when it is seen just outside the Sun's disc.
第二个问题是，当金星在太阳圆盘外被观测到时，它会呈现出光晕。
The light is on. When you leave, please turn it off.
灯亮着。当你离开时，请把它关掉。
One of them told me this: "When you write, you light a bonfire in the spirit world. It is dark there.
其中一个人这样对我说：当你写的时候，你点燃了一簇精神世界的篝火。
But when it is low the peat itself catches light, making the fire much harder to extinguish.
但是当地下水位很低的时候，泥炭层自己也会着火，使得大火更加难以扑灭。
One interesting feature is the bulb's auto-shutoff function. It will only shine when ambient light falls below about 200 lux.
这种灯还有一种有趣的自动关闭功能，它只能在周围光亮低于200流明的时候被点亮。
Since the brain produces the most melotonin in the middle of the night when it is dark, night- shift workers - whose bodies are saturated by artificial light - have abnormally low levels.
大脑在晚间会产生最多的抗黑变激素，而当黑夜加深，上夜班的工人在人造灯的照射下时，抗黑变激素的水平就会不同寻常的低。
The device is attached to a water bottle, and it monitors the clarity inside the bottle, blinking when the light is obstructed by particles.
这种装置放在水瓶上，用来检测瓶子内部的透明物，一旦光线被杂质阻挡了，它就会闪烁。
Besides being light, it does not suffer from any memory effect, which is the loss in capacity when a battery is recharged without being fully depleted.
除了它比较轻之外，它不受任何记忆效应的影响——电池没有耗竭就充电会导致容量上有损失，这种效应称为记忆效应。
When you see just one frequency of light, it is disturbing and the eye tries to accommodate itself to the experience and in the process, different tones appear that do not exist in the place.
若你只看到光的某一频率，你会感到恍惚，然后眼睛会努力适应这一体验，而在这一过程中，不同的色调就会产生。
More plausibly, he had an explanation for what the spots are for: to break up the animal’s shape when it is hiding in the dappled light of the forest.
而更可信的是，他将这些斑点的作用解释为：打散动物的视觉外形以便于在森林斑驳的光影下隐藏自身。
More plausibly, he had an explanation for what the spots are for: to break up the animal's shape when it is hiding in the dappled light of the forest.
而更可信的是，他将这些斑点的作用解释为：打散动物的视觉外形以便于在森林斑驳的光影下隐藏自身。
'It is like a prism and the separation of light that is caused when sunlight is shone through one,' Mr Hutt said.
赫特先生说：“这台相机就像一个棱镜。当其被阳光照射时，就会产生光分离效果。”
When it is running at full throttle, the protons going round it will be travelling within 30cm a second of the speed of light.
当它以最高速度运转时，环绕其轨道传播地质子将达到每秒仅比光速低30厘米的速度。
When the strain is removed, it forms a ripply surface, and the spacing of the ripples affects the colour of the laser light, which varies as the material is stretched.
当这种材料的表面产生张力时，就会产生类波纹状的表面，并且这改变还会影响激光器发出的颜色，并且会随着张力的改变而变色。
It is usually best to perform this when the load on your database is light; many sites run the command daily, early in the morning before the start of business.
通常最好在数据库上的负载非常轻的时候运行该命令；许多站点在每天早晨开始营业之前运行该命令。
When it relaxes, the energy it has absorbed is re-emitted as yellowish light.
放松之后，它所吸收的能量就以稍黄颜色的光重新释放出来。
Jackson's kind of transcendental creativity is typical of very young men; it seldom survives into manhood, when the glory fades into the light of common day.
杰克逊的那种玄奥的创作力绝对是非常年轻之人所特有的，当这辉煌转变成普通生活的灯光 这种创造力就很少会在成年人身上幸存。
The second problem, though, is that laser light can “speckle”, which is to say that when it scatters off a rough surface, a random shimmering and sparkling pattern is produced.
第二个问题就是激光光源会产生“光斑”，也就是说激光会在一个不均匀的表面发生散射，产生随机明暗斑点。
The second problem, though, is that laser light can "speckle", which is to say that when it scatters off a rough surface, a random shimmering and sparkling pattern is produced.
第二个问题就是激光光源会产生“光斑”，也就是说激光会在一个不均匀的表面发生散射，产生随机明暗斑点。
This behaviour is similar to high performance loader when it USES the light appends to load the data.
这种行为类似于高性能加载器使用“轻追加法”加载数据时的行为。
Even when the Moon is totally eclipsed by Earth, it is still bathed in a dim red light - from sunlight that has been bent as it passes through the edge of Earth's atmosphere.
即便月亮全部被地球遮住了，他也依旧沐浴在昏暗的红光之中，这些红光来源于穿过地球大气层时发生弯曲的太阳光。
Light zips along at the actual "speed of light", faster than which nothing can go, only when it is travelling through a vacuum.
只有在真空中，光的速度才能达到真正的“光速”，这是世界上最快的速度。
The fiber is internally reflective at specific points, so that when light is sent along the fiber, some of it bounces back to a detector.
在特定点上，纤维可以向内反射光线，当光线沿纤维传输时，部分会反射到探测器上。
The little giraffe is light in her hand, but when she turns it over to read the tiny price tag stuck to the bottom of its feet she puts it down immediately.
她手里的小长颈鹿很轻，但等她翻到缝在长颈鹿脚上的价格标签一看，迅速放了下来。
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。
Henceforth, I will remember the lesson of the firefly who gives of its light only when it is on the wing, only when it is in action.
从此我要记住萤火虫的启迪：只有振翅的时候，才能发出光芒。
The mixture is ready to be used when it is light, fluffy, and a pale ivory color.
当混合的黄油糊变得很轻，蓬松，有点发白就可以了。
When a car jumps a red light and suffers an accident, he has argued, it is not a failure of the police.
他说，汽车闯红灯出事故非交警之过。
When a car jumps a red light and suffers an accident, he has argued, it is not a failure of the police.
他说，汽车闯红灯出事故非交警之过。
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