单词	paddle wheel
释义	paddle wheel noun A large steam-driven wheel with boards round its circumference, situated at the stern or side of a ship so as to propel the ship through the water by its rotation.With a paddle wheel on each side of the ship, it was found far more convenient in terms of visibility to command the ship from a bridge across the driving machinery between the two wheels.... But steamships were improving as the screw propeller replaced the paddle wheel and iron replaced wood. In 1845, the British Admiralty sponsored a demonstration to determine which was superior, the paddle wheel or screw propeller; the latter clearly won.
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