Two second graders share the plant seeds they have collected while visiting a "seed museum" of Yangfangdian Central Elementary School in Haidian District, Beijing, capital of China, Oct. 16, 2020. (Xinhua/Ren Chao)

Second graders read a book on plants at a "seed museum" of Yangfangdian Central Elementary School in Haidian District, Beijing, capital of China, Oct. 16, 2020. (Xinhua/Ren Chao)

A teacher explains as students listen at a "seed museum" of Yangfangdian Central Elementary School in Haidian District, Beijing, capital of China, Oct. 16, 2020. (Xinhua/Ren Chao)