壁报制作、投影片与实地示范，组成服务性性学习新鲜人研讨会。

The posters, slides and demonstrations below were made as part of a service learning freshman seminar.

youdao

壁报制作、投影片与实地示范，组成服务性性学习新鲜人研讨会。

The posters, slides and demonstrations below were made as part of a service learning freshman seminar.

youdao