marker
n
1
(a) person or tool that makes marks 作标记的人或工具
[attrib 作定语]
a `marker pen 标记笔.
(b) person who keeps the score in certain games （某些比赛中的）记分员.
(c) examiner 主考人.
2 flag, post, etc, that marks a position （指示位置的）旗、 杆等
[attrib 作定语]
a `marker buoy 标志浮标.