aqueduct of syl·vi·usAHD-ˈsilvēəs 基本例句 中脑水管 The ultrastructural characteristics and their functions of ependymal epithelium of the cerebral aqueduct in rats were studied by transmission and scanning electron microscopy.应用扫描和透射电子显微镜观察研究大鼠中脑水管室管膜的超微结构特征。