据确凿无疑的出土的及传世的文物，中国船舶的舵是由桨演变而来的。
Rudders used in China's vessels did evolute from oars according to the undoubted excavated cultural relics and the relics handed down from ancient times.
国家对公民出售个人所有的传世珍贵文物有优先购买权。
The State has priority purchasing right over rare and precious cultural relics handed down from generations and owned by individuals which are put on sale by citizens.
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