当指定ELEMENT指令检索以元素为中心的XML时，如果列具有NULL值，则EXPLICIT模式将不生成相应的元素。
When you specify the element directive to retrieve element-centric XML, if the column has a NULL value, the corresponding element is not generated by the EXPLICIT mode.
TS(跟踪选择，Trace Selection)，每当样式表伪指令执行select操作以从源文档检索数据时就生成一条消息。
TS (Trace Selections) produces a message each time a stylesheet directive performs a select operation to retrieve data from the source document.
该处理器的工作就是检索指令和操作数从记忆并执行每个操作。
The processor's job is to retrieve instructions and operands from memory and to perform. each operation.
最后，要注意xsl：apply - templates指令的使用，它检索字段值。
Finally, note the use of the XSL: apply-templates instruction to retrieve the value of fields.
处理硬件的用途在检索、解释为计算机提供的各种软件指令，并为这些指令的执行提供指导。
The purpose of processing hardware is to retrieve, interpret and direct the execution of software instructions provided to the computer.
它按主存储器里固定的步骤选择和检索指令，以便在适当的时刻激活系统的其它功能组件来执行相应的操作。
It selects instructions from the main memory in proper sequence and sends them to the instruction-decoding unit, which interprets them so as to activate functions of the system at appropriate moments.
处理硬件的用途在于检索，解释为计算机提供的各种软件指令，并为这指令的执行提供指导。
The purpose of processing hardware is to retrieve, interpret, and direct the execution of software instructions provided to the computer.
以往，滤光器只是一个接一个地接通。这一过程由手工完成，极为繁琐，需要一名专家全程用肉眼观察，然后向机器下达指令，告诉它下一步检索什么样的特征。
Traditionally, these were simply plugged in one by one, in a laborious manual process that required an expert human eye to tell the machine what features to look for, in future, at each level.
处理硬件的用途在于检索，解释为计算机提供的各种软件指令，并为这指令的执行提供指导。
A program that translates an instruction into a machine language and executes it before proceeding to the next instruction.
处理硬件的用途在于检索，解释为计算机提供的各种软件指令，并为这指令的执行提供指导。
A program that translates an instruction into a machine language and executes it before proceeding to the next instruction.
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