pushpin

例句：

1. 1.She used a pushpin to hold themap in place.
   她用一个图钉把地图固定住。
2. 2. The teacher pushed pins into the wall to mark the boundariesof the classroom.
   老师在墙上钉了图钉来标记教室的边界。
3. 3. Heused a pushpin to mark his workon the whiteboard.
   他用一个图钉在白板上标记他的工作。