名词
中文翻译：Unknown
同义词：
['threaded part', 'threaded section', 'threaded segment']
例句：
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1. The screw has a threaded portion that fits into the hole.
这个螺丝有一个螺纹部分，可以插入到孔中。
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2. The machine has a threaded portion that can be used to tighten bolts.
这台机器有一个螺纹部分，可以用来紧固螺栓。
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3. The car has a threaded portion that can be removed for maintenance.
这辆车有一个可以拆卸的螺纹部分，用于维护。