Objective: To understand the primary health and dental caries in the relevant circumstances.

目的：了解牙齿卫生与小学生龋病发生的相关情况。

youdao

Here, objective condition includes an object itself, time, space, circumstances, etc.

包括物自体(客观事物)、时间、空间和环境等。

youdao

Here, objective condition includes an object itself, time, space, circumstances, etc.

包括物自体(客观事物)、时间、空间和环境等。

youdao