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In chapter 4, methods for producing beams with orbital angular momentum are introduced.

第四章介绍了产生拥有轨道角动量的光束的方法。

The precise definition of the angular momentum of a body is complicated .

要给物体的角动量下精确的定义是困难的。

In this chapter we will discuss angular momentum.

本章将讨论角动量。

Angular momentum conservation is based on the isotropy of space.

角动量守恒是以空间的各向同性为基础的。

In other words, the magnitude of the angular momentum is increased, its direction remaining the same.

换句话说，即角动量的大小增加了，但其方向不变。

In recent years, there have been many researches focusing on orbital angular momentum of light beam in the field of optics.

近年来，在光学领域内，关于光束轨道角动量的研究，受到广泛的关注。

The variation of the atmospheric angular momentum is obvious in the progress.

此期间大气角动量的年际变化也呈现从小到大的过程。

In chapter 2, the theoretical basis of the orbital angular momentum of light is presented.

主要从经典电磁场理论出发，分别介绍了傍轴近似和非傍轴近似下光束的轨道角动量和光束的参数之间的关系。

In motions of rotation angular momentum appears in much the same way as linear momentum appears in motion of translation.

在旋转运动中的角动量产生的方式与平移运动中的线动量的产生是基本相似的。

In chapter 3, the orbital angular momentum of complex astigmatic elliptical beams is investigated.

第三章研究了复杂像散椭圆光束的轨道角动量。

If I didn't care what anyone thought, I would.....

如果我不介意别人怎么看，我会。。。。

In recent decades, Chile has mandated earthquake-proofing for new structures, requiring that materials like rubber and features like counterweights be built into the architectural designs to allow buildings to bend and sway during temblors rather than break.

在最近数十年里，智利已经为兴建防震的新土建结构而对建筑材料提出要求，需要的材料类似于橡胶，而特性就象运用在建筑设计中的平衡物体，一旦应用以后，当地震发生时建筑就能弯曲摇摆。