In exploring methods of ship propulsion, in addition to paddle, scull, fan of these tools, in Egypt, Rome and inventions of ancient China have been using the prescribed manner round the ship.

• 在探索船舶推进方法中，除了桨、橹、帆这些工具外，在埃及、罗马和我国古代都曾发明过用明轮的方式推进船舶。