摄远的

Finally,design example of apochromatic telephotolens is given.

最后给出了运用这种方法进行的摄远型透镜组的复消色差设计。

The photographer used a telephoto lens to get his portrait of a guard at Buckingham Palace in London.

摄影师用远摄镜头获得他的肖像是一名守卫者在伦敦的白金汉宫。

Firstly, This paper processes geometry filtration based on character of orbit's apogee and perigee after orbit model is analyzed and based. Secondly Space Debris is separated into two kinds, coplanar and not coplanar according as location interrelation of target and debris. In Dynamic filtration's processing, considering prediction time limit and orbit perturbation, secular effects which have increaser effect is considered so that some need catching danger time point is appeased, some law about time when target and debris pass intersectant line each other is inferred, when debris and object are in different plane and some similar law also is inferred otherwise. The time list is arithmetical progression. These laws can improve calculation efficiency remarkably; Lastly orbit predict is a course approaching least distance. Danger time point in the last step become beginning time point from which debris and object's position and velocity are calculated by SXP4 Model which is an analytic model.By result, determine that relative movement trend is closer or apart, farther calculate the interval apart from time when predictive least relative distance occurs. Least relative distance and time when least distance occurs is calculated finally. It is a fast approach course adopting varied interval.

本文在分析、建立轨道摄动计算模型的基础上，首先采用基于轨道远、近地点特征对大量编目在册的空间碎片进行初步几何静态筛选，然后根据碎片与目标轨道面的相对位置特点把碎片分为异面与准共面两种情况以进行动态筛选，在筛选过程中考虑到预报时限长度和轨道摄动影响，引入了轨道摄动中具有积累效应的长期项以满足危险时间点的捕捉要求，利用了长期项摄动变化线性的特点导出了碎片与目标异面情况下各自过交线的时间序列成准等差数列的规律性和准共面情况下类似的规律性，从而显著地提高了前期轨道筛选的计算效率；最后对剩余危险碎片和目标飞行器利用SXP4轨道预报模型在前期轨道筛选的基础上以各个危险探测时间点为预报的时间起点，并根据预报计算结果，分析目标和碎片在该时间点的运动趋势是相互远离还是相互接近，推出预计最小相对距离发生时刻相对此刻的时间长度，得到其随时间变化的局部最小相对距离以及危险距离发生的时刻和相对速度，这是一个采用变时间步长、快速逼近最小相对距离的过程。

Fish eye lens is a kind of reversed telephoto lens having big relative aperture, large view angle and long back working length. Its view angle can reach 180 degree or even more so it can image object covering semisphere or larger than semisphere to limited plane.

鱼眼镜头是一种具有大相对孔径、大视场角和较长的后工作距离的反摄远镜头，它的视场角可以达到甚至超过180°，因此它能够将半球空域甚至超半球空域的物体成象在有限的象平面上。

Its compact construction makes it convenient for travel and hand held telephoto photography.

其紧凑的结构使它便于旅行和手持远摄拍摄。

For telephoto shooters the result is quite a bonus, as all your lenses will effectively get even more powerful.

适用于远摄射手的结果是相当的奖金，因为所有的镜头将有效地得到更加强大。

Nevertheless, the results strongly supported that 1 Pyxidea mouhotii and Cuora aurocapitata formed a monophyletic clade, whereas Cyclemys atripons was not closer to the Pyxidea-Cuora than to Chinemys reevesii, suggesting that Cyclemys and the Cuora group may have originated from two ancestors; 2 the Geoemydidae with Testudinidae was a sister group rather than with the Emydidae.

结果表明：锯缘摄龟和金头闭壳龟构成单系支，白腹摄龟与此聚类支的亲缘关系较乌龟远，暗示齿缘摄龟属和闭壳龟组可能起源于两个不同的祖先；淡水龟科和陆龟科而不是龟科互为姐妹群。

In the eighteenth century they gained control of Central asia as far as the Pamir Mountains and established a protectorate over the area the Chinese call Xizang but commonly known in the West as Tibet.

18世纪，他们控制了远至帕米尔高原的中亚地区，并在西藏建立了摄政政权。

At the same time, the development of the lens to the series, a few millimeters from the focal length of the fisheye lens to the focal length of 2 meters of super-long telephoto, and with perspective adjustment, zoom away from the emblem, such as night-vision camera lens.

同时，镜头向系列化发展，由焦距几毫米的鱼眼镜头到焦距长达2米的超摄远镜头，并有了透视调整、变焦徽距、夜视等摄影镜头。

Our company offers you a very wide range of optical lenses, including spherical lenses, cylindrical lenses, aspherical lenses, windows, prisms, crystal, mirrors and high precision optical samples etc. In addition, we specilize in customizing photographic lenses and accessories, such as telephoto lens, projector lens, fisheye lens etc.

我们公司为您提供了非常广泛的光学镜头，包括球面镜片，圆柱镜头，片非球面镜片，窗户，棱镜，晶体，镜子和高精密光学样品等此外，我们在定制specilize摄影镜头和配件，如远摄镜头，投影镜头，鱼眼镜头， etc。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！