名词
中文翻译：曲率
同义词：
['straightness', 'concavity', 'convexity例句：1. The curve of the river is breathtakingly beautiful.（这条河的曲线令人叹为观止。）']
例句：
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1. The curve of the river is breathtakingly beautiful.
这条河的曲线令人叹为观止。
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2.The car's shape is very concave.
这辆车的形状非常凹陷。
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3. The surface of the earth is slightly convex.
地球的表面稍微凸出。