英语语法分析

By the 6th month, the subendothelial layer could be distinguished.

内皮下层第6个月可辨认出来。

The dark immune deposits are located mainly in a subendothelial position.

暗淡的免疫复合物主要位于内膜下。

Exposure of normal platelets to vascular subendothelial structures results, within a matter of seconds, in the formation of a haemostatic plug.

当正常血小板暴露于血管内属下的结构中时，几秒钟内即导致血栓的形成。