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。
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。
How do I handle models that should have one and only one row in their database?
我要如何处理模型，应该在他们的数据库中有且仅有一个行吗？
The task is assigned, which means the task is assigned to one and only one user.
任务已分配，这意味着一个任务当且仅当分配给一个用户。
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。
A pronoun must refer to one and only one antecedent to avoid vagueness or ambiguity.
代名词必须有一个，也只能有一个先行词，以免造成模糊或模棱两可。
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。
No, not one is the one and only one. "Muras stretched out a finger, shaking in between two glasses of Klaette's."
“不，不是一片，是一株，只有一株。”穆拉斯伸出一根手指，在科莱特的两只眼镜片之间晃动。
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。
They firmly believe in the idea that there is one and only one true love, and true love endures time and circumstance.
不可救药的浪漫主义者是一群真正相信爱情的人。
Surge of Light: This ability now properly grants its effects to one and only one casting of Smite each time it activates.
光明涌动：该技能现在激活时正确地作用于一次惩击上。
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。
This device provides a correspondence such that to each real number there is one and only one corresponding point on the number line.
这个设备提供书信这样对每个实数有在编号行的仅有的一对应的点。
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。
So, to confine the individual, it seems, to one and only one sphere of life would seem to do an injustice to the internal psychological complexity that makes each of us who we are.
所以，将个人约束在，唯一一个人生阶层之中似乎不公，因为忽视了，内心的复杂度，而这正是让我们每一个人显得独特的原因。
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。
Also make that that you're using XA transaction (distributed transaction), ie. configure everything to use JTA transaction manager and therefore participate in one and only one transaction.
也让你使用XA事务(分布式事务)，即。一切配置为使用JTA事务管理器，因此参与一个且只有一个事务。
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。
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。
Only at the time when one's breathing, mind and posture get into one, one is in the condition of yoga exercise.
只有当呼吸、意识和姿势结合成一体时，才是真正的瑜伽练习。
You mustn't think that there is only one teacher there, and such a kind one as we have here.
你不要以为那儿只有一个老师，像我们这里这样的一位好老师。
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