名词
中文翻译：凹陷
同义词：
['concave', 'recessed', 'pit']
例句：
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1. The car has a concave roof that looks very stylish.
这辆车有一个凹顶，看起来非常时尚。
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2. The floor is recessed into the wall, making it difficult to clean.
地板被嵌入墙里，很难打扫。
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3. There's a pit in the middle of the road, where people often get stuck.
路中间有个坑，人们经常陷进去。