First, based on the theory of Fresnel diffraction, the diffraction patterns are analyzed when the point source at the front focus or it's nearby of the lens.
首先，利用菲涅耳衍射理论，分析了无衍射成像系统中点光源在透镜焦点及焦点前后所产生的无衍射光斑形式。
When a lion tamer holds a chair in front of the lion's face, the lion tries to focus on all four legs of the chair at the same time.
当驯兽师举起一把椅子在狮子面前时，它会试着把注意力同时放在椅子的四条腿上。
The reality of startups is that there is so much opportunity out there that if you just focus on what is in front of you, your company will do fine.
事实上，对那些创业者来说，如果他们关注一下眼前就会发现，还有很多机会在等着他们，而公司也会重获成功。
Now focus on something else about 10-20 feet in front of you.
现在注视距面前约10 -20英尺远的其他东西。
New members say that their voters will not support out-of-area expeditions—the alliance’s big focus just now—unless it is properly defending the home front against any threat from Russia.
北约的新成员表示，他们不会支持目前他们的盟友所关注的跨区域防务，除非这些活动可以抵御来自俄罗斯对他们的国家的威胁。
Again, the focus of these tools is to create REST service APIs in front of the scraping logic so that the consumer of the service is unaware of what's happening behind the scenes.
同样，这些工具的重点是在废弃(scraping)逻辑之前创建REST服务api，以便服务使用者意识不到幕后发生的事情。
Learn to focus on what's in front of you, and find peace in whatever you do.
学会专注于你眼前的事，并在做任何事的时候都心态平和。
I had been a TV producer in my past life, "he said," so I was used to high-pressure deadline situations, where you just totally focus on making all these little decisions in front of you.
“我过去曾经做过电视制片人。”他说，“所以我已经习惯了高压期限的环境，这种环境下你只是完全的关注做出你摆在你面前的这些小决定。”
It wanted to focus on the front end and other business-critical aspects rather than on DBA work.
它想把重点放在前端和其他关键的业务方面，而不仅仅是DBA的工作。
The little telescopes are amazing: if I stretch my arm out in front of me, the telescopes focus on one-quarter of one of my fingernails.
微型显微镜太厉害了：如果我在身前伸展胳膊，显微镜会聚焦到我一片手指甲上的一小块。
In the past, the in-store technology focus for retailers included the traditional front-end point of sale (that is, cash register), associated receipt printers, scanners, and displays.
过去，针对零售商的店内技术包括传统的前端销售点（即收银机）、关联的收据打印机、扫描仪和显示器。
Have we lost the ability to focus on what's in front of us?
我们已经失去了对眼前的事情全神贯注的能力吗？
We'll focus first on the industry's four front-runners, then have a look at the options that will color your buying decision.
我们首先关注的是这个产业的四位佼佼者，然后再看看这些选择会不会为你的购买决定增色。
The camera application has been redesigned to take advantage of a larger screen for quick access to exposure, focus, flash, zoom, front-facing camera, and more.
相机应用程序已被重新设计以充分利用大屏幕的优势：用户可以更方便的访问曝光、对焦、闪光灯、变焦、前置摄像头等功能。
I'm going to keep this post short and sweet because I want you to focus on action, not sitting here staring in front of the screen.
我把这篇文章写得简短而亲切，是因为我想让你付诸行动，而非只是坐在电脑前盯着屏幕看。
When you are short-sighted, your eyes focus well only on close objects, while more distant objects appear blurred. This is because light rays focus in front of the retina.
近视是指一个人对近距离的物体比较容易看清而远处的物体看不清楚的现象，它的产生是由于光线的聚焦点落在了视网膜之前。
Do your requirements focus on the front-end capabilities of the document repository or do they focus on the back-end?
您的需求主要关注文档存储库的前端功能，还是后端功能？
Look to the back and front and from side to side of your audience, selecting an individual to focus on and then moving on to someone.
前后左右地环视你的听众，选择一个人作为焦点，然后再换另一个人。
If you're a front-end developer, this is the part of Rails you should focus on.
如果你是前端开发者，这是Rails中你应该特别专注的部份。
Arguably, Apple's been slipping for some time on this front, as Jobs and the company's focus have been elsewhere.
可以说苹果有时候在这边滑，而其实乔布斯和公司的重点在其他地方。
Ensure that the editor in which the Configuration Details file is open is in front and has focus.
确保ConfigurationDetails文件在其中打开的编辑器位于前面并且具有焦点。
New members say that their voters will not support out-of-area expeditions-the alliance's big focus just now-unless it is properly defending the home front against any threat from Russia.
新入约成员国称其选民不会支持赴本地区外的远征行动-而这正是北约目前的重点-除非这样的行动恰能保护本国不受俄罗斯威胁。
With myopia, light comes to focus in front of the retina instead of on the retina.
患有近视，光是聚焦在视网膜前方而不是视网膜上。
The employee motivation always is a hot topic and focus management theories study, due to large-scale emergence of part-time employees, the part-time employee motivation is also the front subject.
员工激励始终是管理理论研究的一个热点和焦点，由于兼职员工的大规模出现，因而兼职员工激励更是管理理论的前沿课题。
Everybody stands up! This means that your 200mm will get an out-of-focus view of the back of the shirt of the person in front of you, but little else.
这意味着你的200mm将拍到你前面那人衬衫后背模糊的影像，或许还有一点点别的。
Refraction - Using an instrument called a phoropter, your optometrist places a series of lenses in front of your eyes and measures how they focus light.
屈光状态检测——通过使用综合屈光检测仪，验光师将一套镜片放在眼镜的前面测量出眼球是如何聚焦光线的。
There is a point of sharp focus, and any object in the front or back of that point will look unsharp.
镜头中存在一个对焦点，在对焦点之前或者之后的物体都是不清晰的。
Open source CMS rise, greatly shorten the development cycle of the construction of the website, can take more time to focus on web page design, web front end and the user experience.
开源的CMS兴起，大大缩短了网站建设的开发周期，能够把更多的时间精力集中在网站页面设计、网站前端、用户体验上。
Open source CMS rise, greatly shorten the development cycle of the construction of the website, can take more time to focus on web page design, web front end and the user experience.
开源的CMS兴起，大大缩短了网站建设的开发周期，能够把更多的时间精力集中在网站页面设计、网站前端、用户体验上。
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