Upper threading is not correct上线不正确 Upper thread tension is set too high/tight上线张力过大 Upper thread is too large for the needle eye对于针眼而言，上线太粗...
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Belt is too tight or too loose皮带过松或过紧 Upper threading is not correct上线穿线不正确 Thread may be caught or is catching on something线被什么物体勾住了 ..
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