光线的

This paper discussed the algorithm of horizontal obligue axonometric projection of shade and shadow on spheric surfaces in light ray and projection directions.

对于任意方向的光线，作图很难完成。本文给出了任定投影方向，任定光线方向，圆球及其阴影的水平斜轴测投影的算法。

Most point-and-shoot cameras have a simple exposure override facility, normally allowing you to overexpose or underexpose your picture. So if the subject is predominantly dark, experiment by overexposing to compensate. If the subject is predominantly light, then underexposure is the way to go. Try taking a test picture, look at it on the screen on the back of your camera, check the histogram, and adjust your exposure compensation. Don't be afraid to shoot four or five versions, as the LCD screen is not always accurate. You can delete the bad pictures later.

大多自动数码相机都具有曝光优先功能，一般都允许你在拍照时过度曝光或曝光不足，如果被拍摄物体整体光线比较强，可以减弱曝光强度，如果被拍摄物体整体光线比较弱，可以选择过度曝光，试着多拍摄几张照片，通过相机背部的液晶屏观察柱状图，调节曝光补偿等级，因为液晶屏的显示效果不很精确，别嫌麻烦，多拍几张照片，之后，对于效果不理想的照片可以删除。

A tube containing a convex achromatic lens at one end and a slit at the other with the slit at the focus of the lens; light rays leave the slit as a parallel beam.

一端包含一个凸起的消色差透镜另一端在镜头的中心有一个小切口的小管；光线通过小切口成为平行光线。

Its properties and tracing method are discussed. And the highlight-line model on triangular mesh surface is implemented. The theories put forward in this paper are demonstrated.

提出了三角网格曲面高光线模型的定义，讨论了相关性质及追踪方法，并在三角网格曲面上实现了高光线模型，验证了论文提出的相关理论。

A too bright light, the visual pollution, Too dim light, will cause damage to eyesight.

太过明亮的光线，会对视觉造成污染；太过黯淡的光线，则会对视力造成损害。

They generally work reflectively when external light levels are high, and transmissively in darker environments via a low-power backlight.

当外部光线很足的时候，该LCD按照反射型工作，而当外部光线不足的时候，它又能当作透射型使用。

If you are creating an asymmetric wall mounted uplight, this means you should created in the Left CPlane with the light directed to the upper left portion of the screen.

如果用户建立的非对称墙面配有朝上光线，这意味着用户必须利用导向屏幕左上部分的光线在左侧架构平面内建立反射器。

B. The pupil reflexively dilates in the dark, allowing maximum light to enter the eye.

A 图在亮的光线会使瞳孔压缩反应缩小， B 图在黑暗时瞳孔允许最大的光线进入眼睛。

The dark band of dust that obscures the mid-section of the Sombrero Galaxy in optical light actually glows brightly in infrared light.

在普通光线下黑暗的尘埃带让草帽星系中间截面模糊不清，但在红外光线下能看到那里却发出明亮的光。

Using Radial blur allowed me to add a bit of variety to the sunrays by making the sunrays converge on one point.

用光线模糊可以让我在制作光线聚合为一点的时候增加一些光感的变化。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。