In this case, you use the function urn: oasis: names: tc: xacml: 1.0: function: string-one-and-only.
该例中使用函数urn：oasis：names：tc：xacml： 1.0：function： string - one - and - only。
In short, for each Arabic numeral, there is one, and only one, Roman numeral which maps to it.
简而言之，每个阿拉伯数字对应一个罗马数字，而且只有一个罗马数字映射到它。
This game signaled the return of our very own Captain Marvel, the one and only John Terry.
这场比赛标志着我们唯一的神奇队长约翰·特里的回归。
If a category always drills to one and only one category then the two levels should be merged.
如果一个分类总是属于一个且只属于一个分类，那么这两个层次就应该合并。
But this class needs to implement one — and only one — interface.
但是，此类需要实现一个接口，而且只实现一个接口。
Different roles will use different tools, so there will not be the one and only tool.
不同的角色使用不同的工具，所以不存在独一无二的工具。
Composed method says that each method should do one and only one thing, and this method violates that rule.
组合方法模式指出，每个方法应该只做一件事，这个方法违反了此规则。
The day before she died, unexpectedly at home, I told her I loved her; the one and only time I can recall saying those words to her.
在她去世的前一天，我自己都没料到，在家，我会告诉她我爱她，这是我能回想起来的唯一一次我说这三个字给她听。
Composed method encapsulates the idea that all your methods should do one and only one thing, making them as small as possible.
组合方法的思想是你所有的方法中每个方法应该做也只能做一种事情，尽量使他们短小精悍。
The one and only way in which I have been able to clear this away is to turn my mind and thoughts to good and to God.
而我能摆脱这种情结困扰的一种也是唯一的一种方法是将心灵和思想转向从善和信仰上帝。
It is the one and only Wonder that does not need speculations concerning its appearance, size, and shape.
也是唯一一个不无需要我们推测对其外观、大小以及形状进行推测的奇迹。
While this is a very slow and mellow track – it’d be perfect for some quality time with your one and only.
这是一首旋律很缓慢的，很轻柔的歌——在某个精心的时刻，只有你很你的另一半，这是最棒的。
But fear not, because you have just stumbled upon the one and only article that gives the game loop the attention it deserves.
但别担心，因为你正好遇到这篇文章，这是唯一一篇给予游戏循环应有重视的文章。
Evidently one, and only one, tiny leaf beetle can dance on this pin's head — the silvery circle in this 40 X photo.
显然一个，并且只有一个，小小的叶甲才能在这个大头针顶——这张40倍图片上银色的圆周——上跳舞。
For example, a query can be constrained to return one and only one result, or only the first 20 selected results.
例如，查询可以限定只返回一个且只有一个结果，或者只返回前20个查询结果。
He formed me in the secret places and he knit together my personality, my passions and my body to make the one and only me.
他在那个隐秘地方里塑造我，将我的性格、情感和我的身体粘合成独一无二的我。
If he sounds happy that you call during the day, invites you to his office and takes you to company parties, you're most likely his one and only partner.
如果他白天接到你的电话很开心，邀请你到他的办公室，带你参加他的同事聚会，那么你往往是他唯一的伴侣。
I recall quite happily downing local brandy and lemonade, a combination I would regard as an abomination in London, on our one and only holiday in Cyprus.
记得曾经有一次，也是唯一一次在塞浦路斯度假时，我非常高兴地喝了当地的白兰地加柠檬水，一种我在伦敦非常讨厌的混合饮料。
Because the servant had not been willing to spend the only talent that he had been given, the master instructs him to give his one and only talent to the man who now has ten.
因为这个仆人不愿意适用他获得的唯一，的金币，主人命令他把这个，唯一的金币给了那个已经有十个金币的人。
This design presents a reasonably secure system; as long as each voting user has one and only one acceptable E-mail account, there is reasonable assurance that users could not vote twice.
这种设计可以得到一个比较安全的系统；条件是每个投票的用户都有且只有一个可以接受的电子邮件帐号，这样就可以保证每个用户都不会投两次票。
There may be more than one consistent set of things that could happen at the various events in space-time, but one and only one set of things actually does occur.
在不同事件发生的时空可能会有不只一种一致的情形发生，但有一种、也只有那一种事情会真实地发生。
The trust store entry for a self-signed certificate matches one and only one certificate.
自签名证书的信任存储区项与一个且仅与一个证书匹配。
Each XML document contains one and only one root element.
每个XML文档都有且只有一个根元素。
The one and only time my prey escaped me.
有一次，也是唯一的一次，我的猎物从我面前逃开了。
The application needs to be consistent with itself. You always want one and only one way of doing something within an application.
程序需要保持自身的一致性，在程序中做每件事都只能有一种方式。
They've looked at the problem through the lens of their one and only business: advertising.
他们通过自己唯一的业务-广告-来审视这个问题。
Hey, upper east siders, gossip girl here, your one and only source into the scandalous life of Manhattan's elites.
上东区的贵族们，绯闻少女在此，我是你们唯一得到曼哈顿精英们丑闻的渠道。
Verify that for each of the buses there is one and only one bus member as shown below.
验证每个总线有一个且只有一个总线成员，如下所示。
Additionally, an XML document must have one and only one root element.
此外，XML文档有且只能有一个根元素。
There is one, and only one, cause of death at older ages. And that is old age.
老年人死亡原因有一个，且只有一个，那就是老年。
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