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.
在启发式血管追踪过程中，本文构造了一种边缘度量函数来检测血管边缘。
In the heuristics tracking procedure, an edge measure function is defined to detect vessel edge.
在启发式血管追踪过程中，本文构造了一种边缘度量函数来检测血管边缘。
In the heuristics tracking procedure, an edge measure function is defined to detect vessel edge.
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