If you forget to mention a prefix in any step, your expression will return nothing-an error for which it's difficult to track the cause.
如果有任何一个步骤忘记使用这个前缀，那么表达式不会返回任何内容，并且很难搞清楚究竟是哪一步出的错。
A topic expression is defined in terms of expression type, fully qualified topic name, and prefix mapping.
主题表达式包含表达式类型、完全限定主题名称和前缀映射。
The XPath expression used to define the XML part to search in does not contain the namespace prefix — the fully qualified element name (QName), in other words.
用来定义要搜索的XML部分的XPath表达式没有包含名称空间前缀——换句话说，没有包含完全限定的元素名称(QName)。
Indeed, when the XML document USES the default namespace, the XPath expression must use a prefix even though the target document does not.
事实上，如果XML文档使用默认名称空间，那么尽管目标文档没有使用前缀，XPath表达式也必须使用前缀。
These patterns of gene expression are governed by the cellular material - the epigenome - that sits on top of the genome, just outside it (hence the prefix epi -, which means above).
基因表达模式(patternsof geneexpression)受细胞物质外基因所控。外基因，高于基因，通俗点说，基因之外(前缀epi-，意即上面)。
To be more selective, you may prefix the mode expression with u to set the permission for users, g to set it for groups, and o to set it for others.
为了更具可选性，您可以给模式描述加前缀u来设置用户权限，g 来设置组权限，还有o为其他人设置。
The connector prefixes these with a string that can be configured by setting the connector source context property prefix for Expression Columns.
连接器为这些数字添加一个字符串前缀，该字符串可以通过设置连接器源上下文属性Prefix for Expression Columns进行配置。
How is the postfix and prefix increment operator evaluated in an expression?
后缀和前缀增量运算符表达式中的评价如何？
In this paper, a rapid algorithm from infix expression to prefix one is proposed.
本文给出一种将中缀表达式转换成前缀表达式的有效算法。
Gets the expression prefix that identifies expression strings that are supported by the expression editor implementation.
获取表达式前缀，该前缀标识受表达式编辑器实现支持的表达式字符串。
Gets the expression prefix that identifies expression strings that are supported by the expression editor implementation.
获取表达式前缀，该前缀标识受表达式编辑器实现支持的表达式字符串。
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