The results revealed a closedreturn circuit composed of arteriae maxillaries externa, arteriae maxillris interna, vein maxillaris externa and vein maxillaris interna in mandibular region.
结果发现,在下颌区域,颌外动脉、颌内动脉、颌外静脉和颌内静脉形成闭合的循环回路。
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Note that in a closed universe you could start a journey off in one direction and, if allowed enough time, ultimately return to your starting point; in an infinite universe, you would never return.