名词
中文翻译：平坦度
同义词：
['flatness', 'smoothness', 'levelness']
例句：
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1. The car's tires need to be replaced to gain flatness.
为了获得平坦度，需要更换汽车轮胎。
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2. The surface of the road needs to be leveled to gain flatness.
为了获得平坦度，需要平整道路表面。
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3. The new design aims to improve the product's flatness and durability.
新设计旨在提高产品的平整度和耐用性。