n.消息头；露头砖；割穗机；页眉
名词header的复数形式.
Channels operate on messages and message headers. 通道对消息和消息头进行操作。
Headers and footers are assigned to a page style. 页眉和页脚具有相应的页面样式。
Some commonly created masters include headers, footers and navigation. 创建主控文档经常用于页眉，页脚和导航。
