名词短语
中文翻译：黑色中碳钢车轴螺栓和螺母
同义词：
['black mild steel carriage bolt', 'black mild steel carriage nut']
例句：
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1. The engineer used a black mild steel carriage bolt to secure the heavy machine.
工程师用一个黑色的中碳钢车轴螺栓来固定这台重型机器。
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2.The nut was securely fastened onto the carriage bolt with a wrench.
螺母用扳手牢固地固定在车轴螺栓上。
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3.The carriage bolt and nut were essential for maintaining the smooth operation of the conveyor belt.
车轴螺栓和螺母对于保持输送带平稳运行至关重要。