head.ing
n.(名词)The title, subtitle, or topic that stands at the top or beginning, as of a paragraph, letter, or chapter.标题,题目:出现在(如段落、信件或章节)顶部或开始处的标题、副题或论题The course or direction in which a ship or an aircraft is moving.航向:船或飞行器移动的路径或方向
A gallery or drift in a mine.矿井中的水平巷道或小平巷The end of a gallery or drift.水平巷道或小平巷的一端