(zoology) the system of venous blood vessels in an animal
同义词：venous blood system
venation详细解释
ve.na.tion n.（名词）Distribution or arrangement of a system of veins, as in a leaf blade or the wing of an insect.脉序：脉系统的分布或安排，如在叶片或昆虫的翅膀上The veins of such a system considered as a group.翅脉，叶脉：作为整体的该系统的脉 【引伸】 vena.tional adj.（形容词）
