名词
中文翻译：针芯
同义词：
['needle core', 'needle axis']
例句：
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1.The needle armature is the part of a sewing machine that holds the thread in place.
针芯是缝纫机中保持线的位置的部分。
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2. The needle armature is responsible for guiding the needle through fabric.
针芯负责引导针穿过布料。
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3. The needle armature is made of metal and is attached to the needle.
针芯由金属制成，并连接到针上。