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.
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