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Secondly, three kinds of mathematics model of optical vortex beams were introduced here. Then the propagation dynamics of optical vortex beams through the non-axis symmetry system is studied, this chapter includes the introduction of the symmetry vortex beam and the non- symmetry vortex beam, the deduction of the Collins diffract integral formula for the non-axis symmetry system, and the transformation of the vortex beam passing through the non-axis symmetry system has been described by using the numerical simulation. Then the general calculation for the orbit momentum of vortex beams, the matrix form for the orbit momentum of vortex beams, and the photon method to describe the orbit momentum of vortex beams are also introduced here. Finally, the interference about optical vortex beams was studied.

本文对涡旋光束进行了较为全面的介绍和研究，主要内容包括：（1）光学涡旋光束的基本理论，主要是介绍了单个光学涡旋光束在柱坐标中的一些表征，涡旋光束的奇异相位和光学涡旋的相位结构；（2）光学涡旋光束的三种数学模型；（3）光学涡旋光束在非轴对称光学系统中的传播动力学，其中介绍了对称涡旋光束与非对称涡旋光束，推导了非轴对称光学系统的 Collins 衍射积分公式，并利用计算机模拟图描述了对称涡旋光束经过非轴对称光学系统后涡旋形态的改变；（4）涡旋光束轨道角动量的一般计算，涡旋光束轨道角动量的矩阵形式，光子法描述涡旋的轨道角动量；（5）涡旋光束的干涉。

Non-tariff barrier has the export of products of Chinese enterprises restricted by all kinds of barriers in international market, resulting in their massive losses, which is becoming worse with time passing by.

非关税壁垒使得中国企业的产品在国际市场上受到各种壁垒的限制，使得企业遭受巨大损失，且随着时间的推移而愈演愈烈。

Results The isolating function of nonabsorbent gauze was twice as much as that of absorbent gauze; 15sheet absorbent gauze was enough to protect burnwound and provent the oozing of humor from passing through dressing; the permeability of artificial biological dressing was 3.8 times as much as that of superficial skin graft; on wound, the stickiness of artificial biological dressing was 0.5 times as much as that of absorbent gauze.

结果 在抵抗外界污染方面，非脱脂纱布的抵抗力是脱脂纱布的2倍；在隔离保护烧伤创面方面，15层脱脂纱布已能有效保护创面从而防止渗液外漏；人造皮膜的通透性是刃厚皮片的3.8倍；人造皮膜与创面的黏附力是脱脂纱布的1/2。

After Nazi 5 the moon of "the plan passing the problem resolving Jew finally", Hitler has torn up Su De nonaggression treaty , an all-out offensive Soviet Union.

在纳粹通过"最后解决犹太人问题的计划"的5个月之后，希特勒撕毁了苏德互不侵犯条约，大举进攻苏联。

The rest comes from pharmaceuticals passing through the body and into the sewage system — a nonnegotiable pollution source if ever there was one.

剩下的医药制品通过人的身体排入一个不流通的下水道污水系统---这也是一个污染来源，如果真要算上一个的话。

The ridge east of SINLAKU is expected to extend westward to allow a short-term northwesterly track, after which it will be eroded by a passing mid-latitude trough to provide room for recurvature.

森垃克东面的副高将继续西伸并令森垃克向西北移动。预计一道西风槽将於 36 至 48 小时后到来，令该副高东退，所做成的空隙将会容许森垃克作出转向。

In silence, you experience life's passing. In relaxation, you recall the past nostalgically.

你在静止中体会生命时光，你在快慰中怀想古代。

After passing pains of a day, longing can have what nostrum to be able to make he alleviates pressure, charge for the body, energetic ground receives a brand-new day.

经过一天的辛劳之后，多么渴望能有什么妙方能使自己缓解压力，并为身体充电，精力充沛地迎接崭新的一天。

With these customers, our repuation and notability are increased by each passing day and our products are much appreciated by majority of customers.

在他们的影响下，知名度和美誉度与日俱增，产品为广大客户深受好评。

Start of the list, you can set the startAfter value to NULL, or just not passing it at

列表的开始，你可以设置startAfter值为NULL，或者只是没有通过它在

A strange and mysterious deep sea creature.

一种奇异、神秘的深海生物。

It's a yellow rectangle .

这是黄色的长方形。