它推动血液顺着血管流至身体各部位，并运载氧和必不可少的维持身体正常机能的营养素。
It propels blood through vessels to each part of the body, delivering oxygen and other nutrients essential for normal function. The heart is vital because it.
十种药是为罕见或“孤儿”病，因为患者少的情况经常缺乏任何治疗，例如遗传性血管水肿治疗。
Ten are for rare or “orphan” diseases, which frequently lack any therapy because of the small number of patients with the condition, such as a treatment for hereditary angioedema;
躯干和颈部的血管密度高，血管网丰富而层次清楚，而四肢的血管密度低，血管网稀而层次少。
The density of vessels and vessel plexuses in the neck and trunk is higher than that of the legs.
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