Astronomy, geology, human history, fire ecology are on the regular schedule of program topics.

天文学、地质学、人类历史、火灾生态学都在项目主题的常规清单上。

youdao

Astronomy, geology, human history, fire ecology are on the regular schedule of program topics.

天文学、地质学、人类历史、火灾生态学都在项目主题的常规清单上。

youdao