目的：观察乳突大小的性别差异，丰富国人体质调查资料。

Objective: to observe the sizes of mastoid process and enrich the data of Chinese investigation.

youdao

目的：观察乳突大小的性别差异，丰富国人体质调查资料。

Objective: to observe the sizes of mastoid process and enrich the data of Chinese investigation.

youdao