At a gestational age of20 weeks and beyond, the pregnant uterus can press against the inferior vena cava and the aorta, impeding venous return and cardiac output.是什么意思_At a gestational age of20 weeks and beyond, the pregnant uterus can press against the inferior vena cava and the aorta, impeding venous return and cardiac output.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句