Regular expressions can encapsulate a range of lexing patterns, from simple fixed fields to fairly complex nested patterns. 从简单的固定域(FF)到相当复杂的嵌套模式,正则表达式可以封装多种词法分析模式。
The custom header component of the message contains two fixed length fields & an ATM Identifier and an Encoded Length. 消息的定制头部包含两个固定长度的字段&一个ATMIdentifier和一个EncodedLength。
For the customization requirements, it takes a hybrid pattern : several fixed data fields are reserved for each table in default, but still support the sub-table pattern. 它采用一种混合模式满足定制需求:在每个表中默认保留几个固定的数据字段,但是还支持子表模式。
They have long life cycle and relatively fixed living fields, therefore likely to be collected. Moreover, species vary widely in the sensitivity toward environment, which plays a significant role in the sustainment of the integrity of aquatic ecosystem. 它们生活周期长,活动场所相对比较固定并易于采集,且不同种类对环境的敏感程度不同,对于维持水生态系统功能的完整性有着至关重要的作用。
Conclusions : The TV can conform the PTV of local recurrent NPC perfectly when treated by the stereotactic conformal radiotherapy with fixed multi fields. The PTV can be irradiated with high dose when the structures at risk were protected satisfactorily. 结论:采用多方位固定适形野立体定向放射治疗局部复发鼻咽癌,可使其TV高度适形PTV,从而使PTV受到高剂量照射的同时大大减少了邻近正常结构受照?