Due to long-term use without maintaining, the sewing machine was worn out and not clean.As a result,the tension of the machine was not very even and few stitch were loose .
技术性,不容易翻译!
Due to long-term use and without proper maintenance, this sewing machine has become worn磨损 and filthy不干净. As a result, the machine's tension is not very even and individual stitches个别的针脚 were a bit loose.
张力=tension?无法确定...
翻译得完全OK！
亲，你的chinglish 水平很高啊 有木有？.
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