dorsal blood vessel（背血管）是什么意思？音标发音+图解场景

背血管 /ˈdɔːsəl eɪˈɔːtə/ n

English: dorsal blood vessel · 背血管

释义：Canal through which the blood circulates; it is located on the central line of the back of the insect.

这个词出现在以下图解场景（1）