Objective To measure and study the thickness of substance of bone in temporal region.

目的：测量和研究颅颞区骨质的厚度。

youdao

First, the soft, flexible substance inside the bone channels isn't necessarily the remains of blood vessels.

首先，骨管内柔软而有延展性的物质不一定就是血管的化石。

youdao

In the allografts, there is little or no vessel in-growth in the center of the graft, whereas the autograft shows abundant new vessel networks in the bone substance.

同种异体骨中有少量或没有血管长入，而相同时段的自体骨移植中有大量的新生血管网。

youdao

Overuse of vitamin D, a substance that promotes the growth of bone and teeth in children, can be particularly toxic, as can overuse of the mineral iron by older adults.

CNN: ASIANOW - TIME Asia