名词
中文翻译：曲线
同义词：
['slope', 'contour']
例句：
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1.The engineer designed a step curve to help the car climb up the hill.
工程师设计了一个阶梯曲线，帮助汽车爬坡。
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2. The scientist found a step curve in the data that could explain the phenomenon.
科学家在数据中发现了一个阶梯曲线，可以解释这一现象。
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3.The path of the river follows a step curve as it flows through the valley.
河流的路径沿着一个阶梯曲线流动穿过山谷。