An increase in extracellular potassium does in fact shift the pacemaker within the sinus node from the cephalic to the caudal portion.是什么意思_An increase in extracellular potassium does in fact shift the pacemaker within the sinus node from the cephalic to the caudal portion.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句