名词
中文翻译：Unknown
同义词：
['notch', 'notch line', 'groove', 'indentation', 'notch mark']
例句：
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1. The carpenter made a notch in the door to hold the hinges.
木匠在门上做了一个槽口来固定铰链。
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2. The engineer measured the depth of the indentation with a caliper.
工程师用卡尺测量了凹口的深度。
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3.The scientist observed the notch on the rock surface for clues about its age.
科学家观察岩石表面凹口以寻找其年龄线索。