Defining properties is optional, though they do allow to declaratively control the different properties characteristics, including the ability to associate one with a converter.
定义属性是可选的，尽管他们允许声明式的控制不同属性的特征，包括和一个转换器关联。
The optional match section of the iptables command specifies the characteristics that a packet should have to match the rule, such as source and destination address, protocol, etc.
iptables命令的可选match部分指定信息包与规则匹配所应具有的特征（如源和目的地地址、协议等）。
These characteristics can be found in requirements and SOA solutions in various organizations today, although these characteristics are optional for SOA and mandatory for cloud.
这些特征可在当今很多组织的SOA解决方案及需求中找到，只不过在SOA中它们是可选的，而在云计算中它们是必需的。
Optional disc configuration, where more linear throttling characteristics are required.
备选阀瓣结构，适用于要求更好的线性节流特性的应用场合。
The open style teaching of mathematics is comparatively a new kind of teaching model. Its main characteristics include: active participation, dynamic operation, problematic, cooperative and optional.
数学开放式教学是一种新型的教学模式，其主要有如下几个特征：主体性、动态性、问题性、合作性、选择性。
Mechanical characteristics such as strength, or other properties such as corrosion resistance, may be "optional" with respect to machinability.
诸如强度的机械特性或者诸如抗腐蚀性的其它性能，对于机械加工性能可以是“可选的”。
In accordance with the special characteristics of BTP control, two optional fuzzy control methods are put forward. They are regular simple fuzzy control and parameter self-regulation fuzzy control.
针对烧结终点控制的特点，提出了两种可选模糊控制方案，简单模糊控制和参数自调整的模糊控制。
In accordance with the special characteristics of BTP control, two optional fuzzy control methods are put forward. They are regular simple fuzzy control and parameter self-regulation fuzzy control.
针对烧结终点控制的特点，提出了两种可选模糊控制方案，简单模糊控制和参数自调整的模糊控制。
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