vena-caval的用法和樣例：
例句
- The posterior borders of the left ventricle and inferior vena cava are well seen.
左心室和下腔靜脈的后界看得很清楚。 - Its etiology is assumed to be abnormal embryologic development of the inferior vena cava as a result of atrophy failure of the right subcardinal vein in the lumbar portion.
導因為下腔靜脈的異常胚胎髮展結果導致在腰部的右側心下靜脈未萎縮。
