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对于所有的物种来说,他们的脉管系统可以有变异,但是,发现只有单只奇静脉的情况及其罕见。一般来说,左侧副半奇静脉
For all species, their vasculature can vary, but only a single azygous vein is found and rare. In general, the left side of the azygos vein