名词
中文翻译：闭合血管
同义词：
['closed vessel', 'closed vascular system']
例句：
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1.The blood vessels in the skin are closed venations.
皮肤中的血管是闭合的。
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2.During the night, the blood flow through the closed venation of the heart.
夜间，血液通过心脏的闭合血管流动。
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3.The study of blood circulation is essential for understanding the closed venation of the body.
了解血液循环对于理解身体的闭合血管系统至关重要。