The atrium contracts (atrial systole).The tricuspid valve located between the right atrium and ventricle opens for a short time and then shuts.是什么意思_The atrium contracts (atrial systole).The tricuspid valve located between the right atrium and ventricle opens for a short time and then shuts.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句