poor thread tension causing pucker
...insufficient stitches per inch along 缝线不够密 poor thread tension causing pucker 缝线过紧引起起皱 separation at seam where thread was visible 车缝开裂，缝线可见 ..
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poor thread tension causing pucker
线张力差导致起皱
以上为机器翻译结果，长、整句建议使用 人工翻译 。