形容词
中文翻译：凹的
同义词：
['concave', 'convex', 'concave-convex', 'concave-convex surface']
例句：
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1. The car's body is made of a concave-convex material.
这辆车的车体是由一种凹凸材料制成的。
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2. The concave-convex surface of the moon has been studied for its potential to store energy.
月球的凹凸表面已被研究，以探索其储存能量的潜力。
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3. The concave-convex shape of the shell helps it to protect the soft inner layer.
贝壳的凹凸形状有助于保护内部的柔软层。