double-line pen

例句：

1. 1.This double-line pen is very useful for writing on a computer screen.
   这种双线笔在电脑屏幕上写字非常实用。
2. 2.The artist used a double-line pen to create a beautiful landscape painting.
   这位艺术家使用双线笔创作了一幅美丽的风景画。
3. 3.The teacher asked the students to use a double-line pen to write their names in the book.
   老师要求学生们用双线笔在书上写下他们的名字。