名词
中文翻译：凹面
同义词：
['concave', 'recess', 'depression']
例句：
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1. The concavity of the bowl is perfect for holding liquids.
碗的凹面非常适合装液体。
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2. The concavity in the rock can be used to store water.
岩石中的凹面可以用来储存水。
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3. The concavity of the mountain is a natural wonder.
山脉的凹面是一个自然的奇观。