名词
中文翻译：凹陷
同义词：
['concave', 'inward bulge', 'depression']
例句：
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1. The car's bumper is deeply indented into the road.
车的保险杠深深地凹进了路面。
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2. The rock has a concave shape that makes it look like a bowl.
这块岩石有一个凹形的形状，看起来像个碗。
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3. The sunken area was filled with water after the flood.
洪水过后，那个下沉的区域被水填满了。