However, creation and invention involve quite a tough process.
而发明创造，却是一个十分艰苦的过程。
This is one instance of the creation of an ancient invention by China's ancestors.
这是华夏民族的祖先在长期的生产实践中的一次重大发明与创造。
This is one instance of the creation of an ancient invention by China's ancestors.
这是华夏民族的祖先在长期的生产实践中的一次重大发明与创造。
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