Students and teachers hold self-made placards during an anti-bullying campaign in Johannesburg, South Africa, Feb. 21, 2020. Nearly 300 students and teacher of Crawford Preparatory School Lonehill attend an anti-bullying campaign. (Photos: Xinhua)

A student holds self-made placards during an anti-bullying campaign in Johannesburg, South Africa, Feb. 21, 2020. Nearly 300 students and teacher of Crawford Preparatory School Lonehill attend an anti-bullying campaign.

Students and teachers attend an anti-bullying campaign in Johannesburg, South Africa, Feb. 21, 2020. Nearly 300 students and teacher of Crawford Preparatory School Lonehill attend an anti-bullying campaign.