The superior vena cava returns deoxygenated blood from the upper body to the right atrium, and it enters the upper portion of this chamber.是什么意思_The superior vena cava returns deoxygenated blood from the upper body to the right atrium, and it enters the upper portion of this chamber.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句