名词短语
中文翻译：机车牵引力曲线
同义词：
['locomotive tractive force curve', 'locomotive tractive efficiency curve']
例句：
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1. The engineerused a locomotive to test the tractive efficiency curve of the track.
工程师使用一台机车来测试轨道的牵引效率曲线。
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2. The locomotives were designed to operate at the highest possible tractive effort curve.
机车被设计成在可能的最高牵引力曲线上运行。
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3.The curve shows how the tractive effort increases with the speed of the train.
曲线显示了随着火车速度的增加，牵引力如何增加。