四大古代发明改变了中国，改变了世界！
Four ancient inventions changed the China, changed the world!
毋庸置疑，中国是世界上最古老的文明古国之一，其古代发明声震环宇。
China, I need hardly tell you, is one of the world's oldest and most accomplished civilizations with a record of innovation unparalleld anywhere else in earlier world history.
毋庸置疑，中国是世界上最古老的文明古国之一，其古代发明声震环宇。
China, I need hardly tell you, is one of the world's oldest and most accomplished civilizations with a record of innovation unparalleld anywhere else in earlier world history.
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