The way it's usually depicted is as a closed circulatory system.
这种方式通常被描述为一个闭合的循环系统。
Both annelids possess a closed circulatory system with tubular hearts and a dorsal and ventral blood vessel. In both specimens, pin the following.
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：。
The circulatory system is a closed system which means there is no way to let the blood out of the body.
我们的身体是个循环封闭的系统这意味着是不可能让血从身体里出去的。
The circulatory system is a closed system which means there is no way to let the blood out of the body.
我们的身体是个循环封闭的系统这意味着是不可能让血从身体里出去的。
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