marker pip displacement

例句：

1. 1. The artist useda marker to draw the outline of thebuilding.
   艺术家用标记笔勾勒出建筑物的轮廓。
2. 2. The policeman marked thecrime scene with his pen.
   警察用笔在犯罪现场做了标记。
3. 3. Thestudent marked his homework witha red marker.
   学生用红笔标记他的家庭作业。