(in football (soccer) 足球 an act of hitting the ball with your head 用头顶球；头球 a line or block of text that appears at the top of every page in a book or document （计算机打印时自动加在各页顶端的）标头，首标 The header gives the page number and date of the document. 页眉印有页码和文档日期。
see also double-header