First of all, we introduce the materials' source and the process of samples selection.

本章首先对研究所需的资料来源、样本选择过程做了解释和阐述。

youdao

First of all, we introduce the materials' source and the process of samples selection.

本章首先对研究所需的资料来源、样本选择过程做了解释和阐述。

youdao