名词
中文翻译：凹面
同义词：
['concave curve', 'concave surface']
例句：
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1. The car's roof is made of a concave curve that helps it stay in shape.
这辆车的顶棚是由一个凹面曲线制成的，有助于保持形状。
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2. The artist used a concave curve to create the illusion of depth in the painting.
艺术家使用了一个凹面曲线来在画作中创造出深度的错觉。
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3. The concave curve of the moonlight casts a soft glow on the ground.
月光的凹面曲线在地面上投下了柔和的光辉。