名词
中文翻译：平均补给率
同义词：
['means of propulsion', 'mean speed', 'average speed']
例句：
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1. The ship's engine is designed to maintain a constant mean speed.
这艘船的引擎设计成保持恒定的平均速度。
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2.The aircraft's maximum mean speed is 500 knots.
这架飞机的最大平均速度为500节。
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3.The engineer calculated the mean speed of the train based on its historical data.
工程师根据火车的历史数据计算了其平均速度。