题目内容：

造纸术不仅是中国古代的伟大发明，同时也促进了世界文明的发展。请根据下面表格里所提示的内容，以One of the Most Helpful Inventions为题写一篇短文。词数60-80之间。

Invention	Paper
Time	Western Han dynasty
Inventor	Cai Lun
Materials	bark, ropes, rags and so on
Uses	writing, painting, printing books and so on

One of the Most Helpful Inventions

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