名词
中文翻译：内凹槽
同义词：
['internal notch', 'internal recess']
例句：
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1. The car has a deep internal groovethat makes it difficult to drive.
这辆车有一个很深的内凹槽，使得驾驶变得困难。
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2. The machine has an internalgroove that helps it run smoothly.
这台机器有一个内凹槽，有助于它平稳运行。
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3. Thebook has a detailed internal groovethat explains the plot in detail.
这本书有一个详细的内凹槽，详细解释了情节。