single thread chain stitch 单线链状线
two thread chain stitch 双线包缝
two-thread chain stitch [服装] 双线锁缝线迹
single thread chain stitch zigzag 单线曲折链式线迹
4-needle 8-thread chain stitch 四针八线链式线迹
thread chain stitch
链式线缝
以上为机器翻译结果，长、整句建议使用 人工翻译 。
All back rise seams should be two-thread chain stitch or double row lock stitch.
所有后档缝应当用双针链式缝迹或双行锁式线迹。
youdao
Model GK8-24 double-needle four-thread bag sewing closer adapted two paralleled double thread chain stitch with auto-cut system.
袋口热合封口机，可同时缝制两条平行的双线链式线迹，具有更佳的密封性。
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