A fault handler is an optional part of a scope or invoke activity.
错误处理程序是范围或调用活动的可选部分。
Again, the return messages are an optional part of a sequence diagram.
此外，返回消息是序列图的一个可选择部分。
The WSDL document location is the only optional part of this endpoint definition.
WSDL文档位置是这个端点定义中惟一的可选项。
The service provider catalog is an optional part of the service discovery process.
服务提供者目录是服务发现进程中的一个可选的部件。
Some pair programmers regard rotation as an optional part of the practice, and on a small team, or with few programmers willing to pair, there might be little alternative.
有些结对编程者认为轮换是实践中可选的部分，而且在小型团队或者是没有几个程序员愿意结对的团队中，可能没有其它的选择。
Sealing ring is fitted on pump body, while impeller sealing ring is an optional part.
设有泵体密封环，而叶轮密封环为可选用件。
Advanced radiating system prevents the work piece from being affected by temperature and extends service life of the strip lamp. Quartz light filter can be selected as an optional part.
先进的散热系统，确保工件不受温度影响，延长灯管的使用寿命。
Advanced radiating system prevents the work piece from being affected by temperature and extends service life of the strip lamp. Quartz light filter can be selected as an optional part.
先进的散热系统，确保工件不受温度影响，延长灯管的使用寿命。
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