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1Situated behind the heart.
2Specifically designating either of a pair of blood vessels situated behind the vertebrate heart (and which do not persist beyond birth in mammals).
Late 19th century; earliest use found in Science.
礼仪网英汉双解词典包含236457条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。