How do students learn to wear open-backed pants?

It's normal to wear open-backed pants in kindergarten. That's the school. If you wear open-backed pants in primary school, everyone will remember you for life. If you wear open-backed pants in middle school, the teacher will call your parents and ask you to change your pants. If you wear open-backed pants in college, the police uncle at the police station will teach you patiently. If you wear open-backed pants after work, go back to Anding Hospital to find a group of patients in the same boat.