中国为世界科技的进步做出过很大的贡献，其中最有名的可能是 "四大发明"。Francis Bacon 和 Karl Marx 都说过：这些中国的发明改变了人类的历史。"四大发明" 包括哪四个发明？我们来看看。
China made great contributions to the world in terms of technological improvements, among which "the Four Great Inventions" are probably the most well-known. Both Francis Bacon and Karl Marx said that these inventions "changed the history of mankind". What are "the Four Great Inventions"? Let's find out.
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