它定义了一些关于如何处理消息头的语义，比如头的处理是不是可选的。
It defines some semantics for how to treat headers such as whether processing of the header is optional.
打孔冲头可弹性配置，实现一机多用，台面吸气及弯版功能可选配。
Hole punch configuration flexibility to achieve a multi-prupose machine, bending plate feature matches.
可选配增加龙门高度、分度头、刀具冷却系统。
Optinal Parts: Dragon Gate height, index head, cooling system.
有雅典娜的刀，美杜莎的头，阿耳忒弥斯之剑，和其他可选择武器供你处置大批敌人。
Athena's Blades, Medusa's Head, the Sword of Artemis, and other weapons are at your disposal are you dispose of legions of enemies.
可选标头用于提供其他更多详细寻址信息来标识终结点或与终结点交互。
The optional headers are used to provide additional, more detailed addressing information to identify or interact with the endpoint.
电动式(可选气动)震动刀枪头，力量强劲，震动频率高，每分钟可达25000次。
Electric shock and head, strength, vibration frequency is high, up to 25000 times per minute.
可选配扭力检测装置，方便检测旋铆质量(球头专机)。
Can be equipped with a torque detection device to facilitate the detection of spin riveting quality (Ball special purpose machine).
一种刷子，其配备有可选择性旋转的刷头。
A brush is provided with a selectively rotatable brush head.
一种刷子，其配备有可选择性旋转的刷头。
A brush is provided with a selectively rotatable brush head.
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