假设你是一位商人，写一个你的新发明的说明，尽力向全班同学出售这项发明。

一种特殊的钢笔

This special pen was invented by Liu Jie。It has three colors and is used for taking notes quickly in class。 It was invented in 2012。It is made of plastic and steel。 It can remember what the teacher said。 It can also help write down the main points。

译文：

这种特殊的笔是刘杰发明的。它有三种颜色，可以在课堂上用来快速记笔记。它是2012年发明的，由塑料和钢制成。它能记住老师说的话，它还可以帮助写下要点。