英语作文,谈谈你认为四大发明最有用的发明是什么,它的用途是什么,

英语作文,谈谈你认为四大发明最有用的发明是什么,它的用途是什么,
请你用英语写一篇短文,谈谈你认为四大发明最有用的发明是什么,它的用途是什么,并简要阐述(80个词左右).

As we all know,The Compass ,Gunpowder ,Papermaking,and Printing are our Chinese great inventions.Our ancestors created them by their own mind and hand.These inventions not only have an effect on our daily life,but also contribute to the culture all aroud world.But which is the most useful and practical invention to us?Well,as far as I concerned,the paper that we use now was first invented in Han dynasty,at that time this invention did improve their hand writing.Just imagine how our life will be if we live without paper?so,in a word,I think the paper is the most useful invention.