平行光线

The relationship between wavelength and numerical aperture is valid only for increased resolving power when light rays are parallel.

当光线是平行时，波长与 numerical aperture 的相关性在增加解析度时才会有效。

Close-up performance of the Summicron-M is on the same level as the performance at infinity setting actually infinity is that distance where the incoming light rays are parallel to the optical axis.

近摄表现与无穷远时相当(事实上，无穷远处的光线是平行光轴入射的。对多数镜头而言，大约100倍焦距的物距时，入射光满足这一条件)。

This surface works a bit like a giant radio telescope dish in reverse: Rather than focusing parallel astronomical light rays to a point, it collects the scattered plasmons emerging from a tiny sample--positioned strategically near the mirror--and redirects them into a plasmon "beam" in the metallic plane.

这个表面的工作原理相当于一个倒置的巨型射电望远镜的盘面，不同于天文望远镜把平行的天体光线会聚到一点，这一设计起到的作用是收集从一个位置恰好位于像点的微小样品散射出来的等离激元，并把他们重定向成金属平面上的一个等离激元束。

Then put it in the window, select a sunny morning, about seven or eight o'clock, the sun is basically parallel rectangular glass tank fired at one end of the light through the turbid water shot out the other end.

然后把它放在窗前，选择一个晴朗的上午，大约七、八点钟，阳光基本上平行地射向长方形玻璃缸的一端，光线通过浑浊的水，在另一端射出来。

It is found from experiment that when pumped by skew light along the fibre's axis, both transverse electric wave and transverse magnetic wave exist in WGM lasing emission simultaneitly. With the increase of refractive index of cladding dye solution, the wavelength spacing between TE and TM waves of which the radial mode number and angular mode number are the same value decreases, and the central lasing wavelength of WGM bluely shifts to short wavelength direction.

实验发现，在抽运光以偏斜光线方式沿光纤的近轴向抽运时，回音壁模式的光纤激光辐射中，既存在光电矢量和光纤径向垂直的横电波，也存在光电矢量和光纤径向平行的横磁波；随增益包层染料溶液折射率的增加，径向模式数和角模式数相同的TE波和TM波之间的波长差单调减小，回音壁模式激光辐射的中心波长向短波方向移动，辐射的波长范围变窄。

In the approach, a ray is defined as the intersection of two nonparallel planes.

算法中，一根光线被定义为两个非平行平面的交线。

They were never out of the sound of some purling weir, whose buzz accompanied their own murmuring, while the beams of the sun, almost as horizontal as the mead itself, formed a pollen of radiance over the landscape.

他们所到之处，耳边都是潺潺的流水声，水声同他们的喁喁低语交织在一起，而太阳的光线，差不多已经和草场平行，为四周的景色罩上了一层花粉似的光辉。

Outside range of 1 pole day, when sunrise, sunset, sun height is 0, sun's rays line and ground level are parallel, lever vague impression is the most lasting, incline to at infinite long; is noonday, sun height amounts to the maximum in a day, lever shadow

1极昼范围外，日出、日落时，太阳高度为零，太阳光线和地平面平行，杆影最长，趋向于无限长；正午时，太阳高度达一天中最大值，杆影

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。