二种环节动物皆具有闭锁循环系，包括管状的心脏及背血管，腹血管。用大头针标示二标本的下列构造：。
Both annelids possess a closed circulatory system with tubular hearts and a dorsal and ventral blood vessel. In both specimens, pin the following.
中缝背核在针剌镇痛过程中起重要作用。
Nucleus raphe dorsalis (RD) plays an important role in acupuncture analgesia.
传统的高速经编机主要采用花盘凸轮式横移机构，推动梳栉完成针前、针背横移。
Traditional high speed warp knitting machine mainly uses cam as pattern drive mechanism, making guide bars accomplish overlap and under lap.
可用一滑动控制块把滑动件相对针背升降到各钩尖端位置上。
To raise and lower the slide to the various positions of the hook tips relative to the needle back, a sliding control block may be provided.
1型背筋机适用于棉布、汗布、羊绒、羊呢、皮质等手套装饰缝，有二针和四针。
Model GG0807-1 Dorsal rib machine, Adaptable to decorative sewing glove materials including cotton cloth, sweat cloth, cashmere, woolen fabric, leather etc, with 2-needle or 4-needle option.
1型背筋机适用于棉布、汗布、羊绒、羊呢、皮质等手套装饰缝，有二针和四针。
Model GG0807-1 Dorsal rib machine, Adaptable to decorative sewing glove materials including cotton cloth, sweat cloth, cashmere, woolen fabric, leather etc, with 2-needle or 4-needle option.
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