中层

Male-sterility mainly results from the abnormality of mesospore,tapetum tissue and vascular bundle.

中层组织、绒毡层组织及药隔维管束异常均是雄性败育的。

There are two other forms of arteriosclerosis (hardening of the arteries) in addition to atherosclerosis: arteriolosclerosis and medial calcific sclerosis.

动脉粥样硬之外,还有其它两种式的动脉硬（动脉变硬）∶细动脉硬动脉中层钙。