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。
Step 4: Evaluate the regular expression.
第4步：评估正则表达式。
Each step in a path expression can also contain a predicate that filters the elements that are returned by that step, retaining only elements that satisfy some condition.
路径表达式中的每一步还可以包含一个谓词，用于过滤该步返回的元素，只保留满足某种条件的元素。
But making a particular facial expression is just the first step of a smile.
但做出某种特别的面部表情，只是微笑的第一步。
The first step is to create a compatible regular expression out of each query word, although modification is only required if the word contains a wildcard character: *.
第一步是创建与每个查询词一致的正则表达式，只有在查询词包含通配符 * 时才需要修改。
In each axis step of a path expression, the node test comes between the axis and any predicates that might be present for arbitrary filtering.
在路径表达式的每个轴步骤中，节点测试出现在轴和谓词(用于进行任意筛选)之间。
Step 3: If the expression doesn't contain any more parentheses, the process of evaluation is finished.
步骤3：如果表达式中不包含其它括号，求值的过程就完成。
The final collection of nodes gathered during the last step in the query expression is the set of resulting nodes for the query expression.
在查询表达式的最后一步中收集的最终节点集合是查询表达式的一组结果节点。
Step 6: at this point of the evaluation, W3Eval removes redundant parentheses from the expression.
步骤6：在求值的这一步，W3Eval从表达式中除去冗余括号。
The first step of the path expression calls the db2-fn: xmlcolumn function to obtain a list of XML documents from the CONTACTINFO column of the CLIENTS table.
路径表达式的第一步调用db 2 - fn：xmlcolumn函数从clients表的contactinfo列获得一个xml文档的列表。
In reasoning process of product conceptual design, expression of knowledge of design problem is a pivotal step.
在产品概念设计的推理过程中，设计问题的知识表达是关键的第一步。
It has been generally accepted that the increase of calcium is only part of the first step in this process and does not depend on gene expression.
已经广泛接受的说法是钙离子的增加仅仅是该过程中第一个步骤的一部分并且不依靠于基因表达。
In a second step, this calcium increase will induce gene expression - the synthesis of proteins that will lead to new or reinforced synaptic connectivity.
第二步是，这种钙离子的增加会诱导基因表达—合成蛋白并用以生成新的或者巩固突出连接。
The magnetic network model of hybrid step motor is established according to the air gap late permeance method, and the expression of the harmonic back EMF is deduced.
利用气隙比磁导法建立了混合式步进电动机的磁网络模型，推导出谐波反电势的表达式。
Self-expression is the first step to dialogue, to communication and the exchange of ideas.
自我表达是开启对话的第一步，也是沟通和交流思想的最始一步。
Transcription is the first major step in gene expression, and constitutes an important point of genetic information flow.
基因转录是遗传信息传递和表达的枢纽，是基因表达调控机制发挥作用的重要环节。
The first step is to cluster gene expression data.
第一步是聚类基因表达数据。
According to the total stress-strain tests, the expression of caving step length of roof is validated combining with the observed data.
根据岩石的全应力应变试验，结合现场实际观测数据，对以应变为指标的岩梁断裂步距表达式做了初步验证。
The technology of either the neutral expression with STEP, or the networked data conveying with the core of XML, has its own characteristics.
以STEP为核心的中性文件数据表达技术，和以XML技术为核心的网络数据表达方式，各有自己的优点。
In this paper, the magnetic network model of hybrid step motor is established according to the air gap rate permeance method, and the expression of the harmonic back EMF is deduced.
利用气隙比磁导法建立了混合式步进电动机的磁网络模型，推导出谐波反电动势的表达式。
The advance could be a significant step toward understanding the basic processes that underlie gene expression.
这项技术在理解基因表达背后的基本过程方面是一次显著的进步。
PHGDH catalyses the first step in the serine biosynthesis pathway, and breast cancer cells with high PHGDH expression have increased serine synthesis flux.
PHGDH催化丝氨酸生物合成途径的第一步，PHGDH高表达的乳腺癌细胞丝氨酸合成通量上升。
Transcription is the process by which DNA is copied into RNA in the first step of gene expression.
转录是基因表达的第一步，在这个过程中DNA被复制为RNA。
After the video has been taken, husband could step out and enjoy the dishes and the thunderstruck facial expression on supervisor's face.
视频拍完毕丈夫就可以出来了，一边吃菜一边欣赏混蛋脸上惊愕的表情。
Experiments were divided into two steps: the first step, the expression of NGF were investigated in healing impaired diabetic rat ulcer (a group) and normal rat ulcer (b group).
实验分两个步骤：第一步，对比糖尿病慢性难愈合创面大鼠组(a组)和正常大鼠创面(B组)组中ngf表达含量的变化。
Baculovirus expression system (BES) is one of the most important expression systems. Baculovirus also has potential ability as pesticide. DNA replication is the central step in its life cycle.
综述了与杆状病毒DNA复制相关基因的研究进展。杆状病毒表达系统是最重要的四大基因工程表达系统之一，杆状病毒还具有作为生物杀虫剂的潜能。
Baculovirus expression system (BES) is one of the most important expression systems. Baculovirus also has potential ability as pesticide. DNA replication is the central step in its life cycle.
综述了与杆状病毒DNA复制相关基因的研究进展。杆状病毒表达系统是最重要的四大基因工程表达系统之一，杆状病毒还具有作为生物杀虫剂的潜能。
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