sinus pericardialis是什么意思

用法例句

The ultrastructure of the kidney and pericardial gland of the clam Nuttallia olivacea was observed with transmission electron microscopy.

用透射电镜观察了紫彩血蛤（Ｎｕｔｔａｌｌｉａ ｏｌｉｖａｃｅａ）的肾脏和围心腔腺的超微结构。