Every node has one and only one primary node type.
每个节点都有且只有一个主节点类型。
Each ID should be a member of one and only one group.
每个ID应该为一个且仅一个组的成员。
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。
Multiple Tasks can be associated to one and only one Issue.
多个任务可以联系到一个且唯一一个问题上。
There is one and only one integration stream for a project.
对项目有一个且只有一个集成流 。
With one mouse click, a user can choose one and only one option.
当鼠标单击时，用户能够且只能够选择一个选项。
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。
OnSNMP is supported on a host that is running one and only one server.
OnSNMP由一个主机来支持，这个主机运行一个且只有一个服务器。
A child (or derived) class can have one and only one parent (or base) class.
一个子(或继承的)类只可以有一个父类(基类)。
Do people believe anyone has one and only one measure of attractiveness?
难道人们真的认为吸引力只有一个衡量的尺度吗？
Or, differently said: "A class should have one and only one responsibility".
另一种说法是：“一个类应该有且只应该有一个原则”。
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。
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。
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。
These last are elements in a <one-of> structure, indicating that one and only one can apply at a time.
最后是 <one-of>结构的元素，表示一次能够且只能够应用一个规则。
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。
In the previous use case examples, the rights granted to a principal were derived from one and only one profile.
在上一个用例中，授权主体的权限仅由一个配置文件驱动。
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。
In addition, the metadata should have a wsrrtm_authoritativeWSDLs relationship to one and only one WSDL document.
此外，元数据应当对一个（且仅有一个）WSDL文档有一个 wsrrtm_authoritativeWSDLs关系。
Yet another problem is that the wildcard also allows userName, so the "one and only one" rule cannot be enforced.
另一个问题是通配符也允许userName，因此无法实现“有且仅有一个”的规则。
When using Auto Layout, the goal is to provide a series of equations that have one and only one possible solution.
当你使用自动布局时，目标是提供一系列的方程式，而这些方程式有且只有一种解决方法。
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 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。
With the help of the negative wildcard, you can now express the "one and only one userName and anything else" rule as in Listing 4.
借助否定通配符(negative wildcard)，现在可以表示“有且仅有一个userName，但可以有任意多个任何其他元素”规则，如清单4所示。
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。
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。
For example, to express a content model for "one and only one element called userName and any number of any other elements, before or after userName", you define the content model as in Listing 3.
例如，为了表示内容模型“有且仅有一个名为username的元素，但是可以有任意数量的任何其他元素，这些元素可以位于userName之前或之后”，可以定义如清单3中所示的内容模型。
My only gripe is that one main course and one dessert were unavailable.
我惟一的不满是还差一道主食和一份甜点。
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。
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。
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