名词
中文翻译：正常直径的线材
同义词：
['standard diameter', 'standard thread pitch例句：1. The machine is designed to operate at a normal diameter of 20mm.（这台机器的设计直径为20毫米。）']
例句：
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1. The machine is designed to operate at a normal diameter of 20mm.
这台机器的设计直径为20毫米。
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2.The thread pitch was chosen to ensure the best fit and strength.
选择线材时，确保最佳匹配和强度是关键。
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3. The manufacturer recommends using a normal diameter of 2.5mm for this type of screw.
制造商建议使用这种螺丝的直径为2.5毫米。