名词
中文翻译：正常螺纹
同义词：
['standard threading', 'standardized threading']
例句：
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1. The machine has a normal threading for easy assembly.
这台机器有标准的螺纹，便于组装。
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2. The screws are of normal threading for easy turning.
螺丝是标准螺纹，易于转动。
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3. The bolts have normal threading to ensure stability during installation.
螺栓有标准螺纹，以确保安装过程中的稳定性。