名词
中文翻译：凹槽
同义词：
['notch', 'groove', 'notch', 'indentation']
例句：
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1. The groove in the wall is deep enough to hold a key.
墙上的凹槽足够深，可以容纳一把钥匙。
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2. The grooves on the surface of the stone are smooth and even.
石头表面的凹槽光滑且均匀。
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3. The grooves in the floor were made by someone walking on them.
地板上的凹槽是某人走动时留下的。