名词
中文翻译：不完美的线
同义词：
['defective thread', 'imperfection in thread']
例句：
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1.The defective thread caused the sewing machine to jam.
不完美的线导致缝纫机卡住。
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2.The workmanship on this piece of furniture is quite poor, with many imperfections in thread.
这件家具的做工很差，有很多不完美的线。
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3.Repairing the defective thread will require a lot of time and effort.
修复不完美的线需要很多时间和努力。