名词
中文翻译：基本孔
同义词：
['fundamental bore', 'essential bore']
例句：
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1. The basic bore of the machine is 20mm.
机器的基本孔径为20毫米。
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2. The engineer found that the basic bore was too small for the material to pass through.
工程师发现，基本孔径太小，材料无法通过。
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3. The design of the drill bit is based on the basic bore size.
钻头的设计基于基本孔径大小。