grease pencil

例句：

1. 1.She used a grease pencil to draw the outline of the picture.
   她用润滑铅笔画了这幅画的轮廓。
2. 2. The artist applied a grease pencil to the paper before starting to paint.
   艺术家在开始绘画之前，先在纸上涂上了润滑铅笔。
3. 3. The student tried to write with the grease pencil, but it was difficult to hold.
   学生试图用润滑铅笔写字，但很难握稳。