而这些行不含任何有用值，这些有用值只能在描述同一版本的其他行中找到。
These rows do not contain any useful value that would not be found in the other rows describing that same edition.
这些统计值容易搜集，但是在需要数据的时候，如果没有非侵入性的数据检索机制，那么这些值就不太有用。
These statistics are easy to gather, but without an unintrusive means of retrieving the data when it is needed, they are not very useful.
为了让模型创建和维护方面的成本物有所值，需要确保模型非常有用。
To justify the cost of model creation and maintenance, you need to ensure that your model is highly useful.
这一看起来明显的查询在确定某个特定值是否是模型时十分有用。
This seemingly obvious query is useful in determining whether a particular value is the model.
如果您的数据可以容易地表示为简单对象而不是像字符串和数字这种分离的值时，它会很有用。
This is useful if your data is easily expressed as simple objects, rather than as separate values like strings and Numbers.
在调用具有许多参数，而且其中一些参数有默认值的存储过程时，命名参数特别有用。
Named parameters are especially useful for calling stored procedures that have many arguments and some of those arguments have default values.
如果希望在运行时动态地向消息传递值，则此类额外属性非常有用。
Such extra properties can be useful if you want to pass values dynamically into your message at runtime.
如果对于返回值没有较多要输入的数据，或者返回值无法计算时，此类型的模拟非常有用。
This is useful if you don't have much data to enter for the return value, or when the return values can't be computed.
如果需要编写根据XML和非xml列的值过滤数据的查询，那么这样做很有用。
Doing so can be useful if you need to write queries that filter data based on XML and non-XML column values.
对不常更新的值(如存储名称)使用上述技术将会很有用。
It is useful to use the technique above for less frequently updated values, such as the store name.
例如，作为组织单位的一部分，包括诸如DEV、TEST、QA、PROD之类的值非常有用。
For example, it can be very useful to include values like DEV, TEST, QA, PROD, and so forth, as part of the Organizational Unit.
查询 8使用了XMLCAST，对于各文档只需进行一次XML值连接非常有用，因为它允许在unit.manager 上使用关系型索引。
The latter option with XMLCAST can be useful for joins on XML values which occur only once per document, because it allows the usage of a relational index on unit.manager.
另外，当使用wsadmin以交互模式执行命令时，提供命令的描述和标题非常有用，因为这些值会显示给最终用户。
Also, the description and title of the command are useful to have when the command is executed in interactive mode using wsadmin, because these values are displayed to the end user.
无声故障或标志返回值可能会有用，或另一种用于错误例子的后退操作会有用。
Perhaps silent failure or flag return values would be useful, or another sort of fallback operations for error cases.
每个元素都有一些嵌套的元素，这些元素保留有用来搜索正确的元素的值。
Each element has some number of nested elements that hold the value with which to search for the correct element.
所以，如果你需要用数学式子计算一个值，那就只有用表达式返回这个值，没有其他语法结构可用，因为否则就无法处理这个值。
And so while you needed expressions for math to work, there was no point in making anything else return a value, because there could not be anything waiting for it.
在编写自己的检测器时，打印出它们的值通常是有用的。
When writing your detectors, it's often useful to print the values for them.
当返回值的类型很复杂时，这个重构将很有用，因为变量的类型是自动生成的。
This is useful when the return value has a complex type because the type of the variable is automatically generated.
例如，您可能发现，需求分析员在第一次迭代(曾经发布所有要评估的值)之前完成所有用例的详述工作。
For example, you may find that the requirements analysts have completed detailing all the use cases before the first iteration ever released anything of value to be evaluated.
此索引项是没有用的，因为普通查询不会在其谓词中使用此类串联值。
This is not useful since queries would typical not use such concatenated values in their predicates.
如果用户持有用于比较两个值的规则的豁免权，则不进行比较(换句话说，访问规则没有被应用到那个组件)。
If the user holds an exemption for the rule that is being used to compare two values, then that comparison is not done (in other words, access rule is not applied for that component).
一个有用的技巧是为带句点的词干赋值，这个值将成为基于这个词干的复合名字的默认值。
One useful trick is to set a value for the dotted stem, which then ACTS as a default value for compound names based on the stem.
就象数组那样，没有用于直接访问散列值的API。
Just like arrays, there is no API for directly accessing hash values.
下节讨论几个有用的状态值。
The following section discusses several informative status values.
当您需要有关特定操作、操作中涉及的术语及其各个值的信息时，此区域十分有用。
This section proves to be handy in situations where you need information on particular operations, the terms involved within them and their respective values.
这不是最好的办法但它确实有用,我可以得到底的值的类型然后,和一个真的浮点数的类型比比,看他们是不是一样？
Now, this is not the nicest way to do it but it'll work. I can look at the type of the value of base and compare it to the type of an actual float and see, are they the same?
如果安全标签没有用于某个组件的值，那么设定该值为空值。
If a security label does not have a value for one of the components, then an empty value is assumed.
展示类别子集的能力，基于另一个类别的值将会非常有用。
The ability to present a subset of categories for selection, based on the value of another category type would be useful, too.
没有用于直接访问数组值的API。
因此对于属性选择器，返回值（虽然不确切但是很有用）是一个值，对于一个元素则是一个节点集（包含一个节点）。
So the return value (sort of a misnomer, but still a useful way to think about things) for an attribute selector is a value; for an element, it's a node set (containing a single node).
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