a single sheet of glass in a window or door 窗玻璃片;框格玻璃 ■(Computing)a separate defined area within a window for the display of, or interaction with, a specified part of that window's application or output (计算机)窗片,子窗口 ■a sheet or page of stamps 整张邮票
语源
late Middle English (originally denoting a section or piece of something, such as a fence or strip of cloth): from Old French pan, from Latin pannus 'piece of cloth'